{"id":284118,"date":"2020-08-26T21:16:50","date_gmt":"2020-08-26T14:16:50","guid":{"rendered":"https:\/\/quipperhome.wpcomstaging.com\/?p=284118"},"modified":"2023-02-07T15:45:41","modified_gmt":"2023-02-07T08:45:41","slug":"grafik-fungsi-trigonometri-matematika-kelas-10","status":"publish","type":"post","link":"https:\/\/quipperhome.wpcomstaging.com\/mapel\/matematika\/grafik-fungsi-trigonometri-matematika-kelas-10\/","title":{"rendered":"Grafik Fungsi Trigonometri &#8211; Matematika Kelas 10"},"content":{"rendered":"<p><img fetchpriority=\"high\" decoding=\"async\" class=\"alignnone size-full wp-image-284152\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Grafik-Fungsi-Trigonometri-1.png\" alt=\"\" width=\"800\" height=\"533\" srcset=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Grafik-Fungsi-Trigonometri-1.png 800w, https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Grafik-Fungsi-Trigonometri-1-768x512.png 768w, https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Grafik-Fungsi-Trigonometri-1-585x390.png?crop=1 585w, https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Grafik-Fungsi-Trigonometri-1-263x175.png?crop=1 263w, https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Grafik-Fungsi-Trigonometri-1-300x200.png 300w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<p><span style=\"font-weight: 400;\">Hai Quipperian, bagaimana kabarnya? Semoga selalu sehat dan tetap semangat belajar, ya.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Pada pertemuan ini, Quipper Blog akan mengajak Quipperian untuk belajar tentang grafik fungsi trigonometri. Salah satu penerapan grafik fungsi trigonometri ini adalah untuk mendeteksi ketinggian air laut di bidang oseanografi. Sebenarnya, masih banyak penerapan lainnya.&nbsp;<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Namun, pada artikel ini hal yang akan dibahas bukan penerapan grafik fungsi trigonometrinya, melainkan bagaimana cara menggambar grafik fungsi trigonometri. <\/span><em><span style=\"font-weight: 400;\">So, stay tune<\/span><\/em><span style=\"font-weight: 400;\">!<\/span><\/p>\n<h2><strong>Melukis Pendekatan Nilai \u03c0 Menurut Kochansky<\/strong><\/h2>\n<p><span style=\"font-weight: 400;\">Sebelum menggambarkan grafik fungsi trigonometri, Quipperian harus bisa memastikan bahwa perbandingan antara panjang satuan sumbu-x dan sumbu-y harus tepat. Hal ini bertujuan untuk mendapatkan panjang ruas garis sebesar 2\u03c0<\/span><em><span style=\"font-weight: 400;\">r<\/span><\/em><span style=\"font-weight: 400;\">.&nbsp;<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Itulah sebabnya sebelum melukis grafik fungsi trigonometri, Quipperian perlu mengetahui cara melukis pendekatan nilai \u03c0. Nah, salah satu cara yang biasa digunakan adalah cara Kochansky, yaitu sebagai berikut.<\/span><\/p>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-284147\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Grafik-Fungsi-Trigonometri-a.png\" alt=\"\" width=\"270\" height=\"179\"><\/p>\n<p><span style=\"font-weight: 400;\">Jika dijabarkan dalam bentuk matematis, akan menjadi seperti berikut.<\/span><\/p>\n<p><span style=\"font-weight: 400;\"> <img decoding=\"async\" class=\"alignnone size-full wp-image-284146\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Grafik-Fungsi-Trigonometri-b.png\" alt=\"\" width=\"222\" height=\"100\"><\/span><\/p>\n<p><span style=\"font-weight: 400;\">Lukis EF = 3<\/span><em><span style=\"font-weight: 400;\">r<\/span><\/em><span style=\"font-weight: 400;\">, sehingga:<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-284145\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Grafik-Fungsi-Trigonometri-c.png\" alt=\"\" width=\"187\" height=\"79\"><\/p>\n<p><span style=\"font-weight: 400;\">Berdasarkan teorema Phytagoras, panjang DF dapat ditentukan sebagai berikut.<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-284144\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Grafik-Fungsi-Trigonometri-d.png\" alt=\"\" width=\"228\" height=\"190\"><\/p>\n<p><span style=\"font-weight: 400;\">Mengingat hasil perhitungan nilai \u03c0 sebenarnya adalah 3,14 maka pendekatan DF sebagai \u03c0<\/span><em><span style=\"font-weight: 400;\">r<\/span><\/em><span style=\"font-weight: 400;\"> sudah cukup teliti.<\/span><\/p>\n<h2><strong>Melukis Grafik Fungsi Trigonometri<\/strong><\/h2>\n<p><span style=\"font-weight: 400;\">Nilai perbandingan trigonometri sudut-sudut istimewa berperan penting dalam melukiskan bentuk grafiknya. Inilah tabel perbandingan trigonometri untuk sudut istimewa.<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-284143\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Grafik-Fungsi-Trigonometri-e.png\" alt=\"\" width=\"394\" height=\"208\" srcset=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Grafik-Fungsi-Trigonometri-e.png 394w, https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Grafik-Fungsi-Trigonometri-e-300x158.png 300w\" sizes=\"(max-width: 394px) 100vw, 394px\" \/><\/p>\n<h3><strong>1. Melukis grafik fungsi sinus menggunakan tabel<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">Adapun langkah-langkahnya adalah sebagai berikut.<\/span><\/p>\n<p>a. Gunakan nilai perbandingan trigonometri untuk sudut istimewa dengan sudut relasi sebagai <em>x<\/em>.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-284142\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Grafik-Fungsi-Trigonometri-f.png\" alt=\"\" width=\"503\" height=\"115\" srcset=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Grafik-Fungsi-Trigonometri-f.png 503w, https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Grafik-Fungsi-Trigonometri-f-300x69.png 300w\" sizes=\"(max-width: 503px) 100vw, 503px\" \/><\/p>\n<p><span style=\"font-weight: 400;\">b. Melengkapi nilai pada tabel, lalu tulis pasangan koordinat titik-titiknya dalam radian atau derajat.<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-284141\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Grafik-Fungsi-Trigonometri-g.png\" alt=\"\" width=\"434\" height=\"96\" srcset=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Grafik-Fungsi-Trigonometri-g.png 434w, https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Grafik-Fungsi-Trigonometri-g-300x66.png 300w\" sizes=\"(max-width: 434px) 100vw, 434px\" \/><\/p>\n<p><span style=\"font-weight: 400;\">c. Lukis titik tersebut dalam koordinat kartesius yang sesuai.<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-284140\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Grafik-Fungsi-Trigonometri-h.png\" alt=\"\" width=\"562\" height=\"228\" srcset=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Grafik-Fungsi-Trigonometri-h.png 562w, https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Grafik-Fungsi-Trigonometri-h-300x122.png 300w\" sizes=\"(max-width: 562px) 100vw, 562px\" \/><\/p>\n<p>d. Lukis kurva melalui titik-titiknya.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-284139\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Grafik-Fungsi-Trigonometri-i.png\" alt=\"\" width=\"543\" height=\"214\" srcset=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Grafik-Fungsi-Trigonometri-i.png 543w, https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Grafik-Fungsi-Trigonometri-i-300x118.png 300w\" sizes=\"(max-width: 543px) 100vw, 543px\" \/><\/p>\n<h3><strong>2. Melukis grafik fungsi kosinus menggunakan tabel<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">Sama seperti grafik fungsi sinus, untuk kosinus kamu bisa menentukan terlebih dahulu nilai kosinus sudut-sudut istimewanya.<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-284138\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Grafik-Fungsi-Trigonometri-j.png\" alt=\"\" width=\"463\" height=\"223\" srcset=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Grafik-Fungsi-Trigonometri-j.png 463w, https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Grafik-Fungsi-Trigonometri-j-300x144.png 300w\" sizes=\"(max-width: 463px) 100vw, 463px\" \/><\/p>\n<p><span style=\"font-weight: 400;\">Dengan demikian, diperoleh grafik berikut ini.<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-284137\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Grafik-Fungsi-Trigonometri-k.png\" alt=\"\" width=\"554\" height=\"211\" srcset=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Grafik-Fungsi-Trigonometri-k.png 554w, https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Grafik-Fungsi-Trigonometri-k-300x114.png 300w\" sizes=\"(max-width: 554px) 100vw, 554px\" \/><\/p>\n<h3><strong>3. Melukis grafik fungsi tangen menggunakan lingkaran satuan<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">Jari-jari lingkaran satuan yang diperpanjang sampai memotong sumbu-y, akan menghasilkan gambar berikut.<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-284136\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Grafik-Fungsi-Trigonometri-l.png\" alt=\"\" width=\"169\" height=\"222\"><\/p>\n<p><span style=\"font-weight: 400;\">Dari gambar di atas, kamu bisa mendapatkan beberapa nilai tangen berikut.<\/span><\/p>\n<p><span style=\"font-weight: 400;\"> <img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-284135\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Grafik-Fungsi-Trigonometri-m.png\" alt=\"\" width=\"236\" height=\"115\"><\/span><\/p>\n<p><span style=\"font-weight: 400;\">Nilai di atas menunjukkan bahwa nilai tangennya adalah panjang ruas garis dari titik O sampai ke titik potong jari-jari yang terkait sudut, misalnya sudut <\/span><em><span style=\"font-weight: 400;\">x<\/span><\/em><span style=\"font-weight: 400;\">. Untuk melukis grafik fungsi tangen, kamu bisa melalui titik potongnya, dengan ruas atas bertanda positif dan ruas bawah bertanda negatif.<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-284134\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Grafik-Fungsi-Trigonometri-n.png\" alt=\"\" width=\"593\" height=\"288\" srcset=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Grafik-Fungsi-Trigonometri-n.png 593w, https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Grafik-Fungsi-Trigonometri-n-300x146.png 300w\" sizes=\"(max-width: 593px) 100vw, 593px\" \/><\/p>\n<h2><strong>Grafik Fungsi Trigonometri<\/strong><\/h2>\n<p><span style=\"font-weight: 400;\">Secara umum, grafik fungsi trigonometri dibagi menjadi tiga, yaitu sebagai berikut.<\/span><\/p>\n<h3><strong>1. Grafik fungsi sinus (y = a sin bx, x \u2208 [0<\/strong><sup><strong>o<\/strong><\/sup><strong>, 360<\/strong><sup><strong>o<\/strong><\/sup><strong>])<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">Grafik fungsi sinus, <\/span><em><span style=\"font-weight: 400;\">y<\/span><\/em><span style=\"font-weight: 400;\"> = <\/span><em><span style=\"font-weight: 400;\">a<\/span><\/em><span style=\"font-weight: 400;\"> sin <\/span><em><span style=\"font-weight: 400;\">bx<\/span><\/em><span style=\"font-weight: 400;\">, <\/span><em><span style=\"font-weight: 400;\">x<\/span><\/em> <span style=\"font-weight: 400;\">\u2208<\/span><span style=\"font-weight: 400;\"> [0<\/span><sup><span style=\"font-weight: 400;\">o<\/span><\/sup><span style=\"font-weight: 400;\">, 360<\/span><sup><span style=\"font-weight: 400;\">o<\/span><\/sup><span style=\"font-weight: 400;\">] memiliki bentuk gelombang bergerak yang teratur seiring pergerakan <\/span><em><span style=\"font-weight: 400;\">x<\/span><\/em><span style=\"font-weight: 400;\">. Perhatikan gambar berikut.<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-284133\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Grafik-Fungsi-Trigonometri-o.png\" alt=\"\" width=\"424\" height=\"181\" srcset=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Grafik-Fungsi-Trigonometri-o.png 424w, https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Grafik-Fungsi-Trigonometri-o-300x128.png 300w\" sizes=\"(max-width: 424px) 100vw, 424px\" \/><\/p>\n<p><span style=\"font-weight: 400;\">Berdasarkan grafik di atas, diperoleh sifat-sifat berikut.<\/span><\/p>\n<ol style=\"list-style-type: lower-alpha;\">\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Simpangan maksimum gelombang atau yang biasa disebut amplitudo adalah 1. Simpangan gelombang adalah jarak dari fungsi <\/span><em><span style=\"font-weight: 400;\">x<\/span><\/em><span style=\"font-weight: 400;\"> ke puncak gelombang.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Gelombang memiliki periode satu putaran penuh.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Grafik <\/span><em><span style=\"font-weight: 400;\">y<\/span><\/em><span style=\"font-weight: 400;\"> = sin <\/span><em><span style=\"font-weight: 400;\">x<\/span><\/em><span style=\"font-weight: 400;\"> memiliki nilai <\/span><em><span style=\"font-weight: 400;\">y<\/span><\/em><sub><em><span style=\"font-weight: 400;\">maks<\/span><\/em><\/sub><span style=\"font-weight: 400;\"> = 1 dan <\/span><em><span style=\"font-weight: 400;\">y<\/span><\/em><sub><em><span style=\"font-weight: 400;\">min<\/span><\/em><\/sub><span style=\"font-weight: 400;\"> = -1.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Titik maksimum gelombang adalah adalah (90<\/span><sup><span style=\"font-weight: 400;\">o<\/span><\/sup><span style=\"font-weight: 400;\">, 1) dan titik minimumnya (270<\/span><sup><span style=\"font-weight: 400;\">o<\/span><\/sup><span style=\"font-weight: 400;\">, -1).<\/span><\/li>\n<\/ol>\n<p><span style=\"font-weight: 400;\">Jika persamaan fungsi trigonometrinya diubah menjadi <\/span><em><span style=\"font-weight: 400;\">y<\/span><\/em><span style=\"font-weight: 400;\"> = <\/span><em><span style=\"font-weight: 400;\">a <\/span><\/em><span style=\"font-weight: 400;\">sin <\/span><em><span style=\"font-weight: 400;\">x<\/span><\/em><span style=\"font-weight: 400;\"> dengan <\/span><em><span style=\"font-weight: 400;\">a<\/span><\/em><span style=\"font-weight: 400;\"> = 2, diperoleh grafik berikut.<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-284132\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Grafik-Fungsi-Trigonometri-p.png\" alt=\"\" width=\"419\" height=\"211\" srcset=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Grafik-Fungsi-Trigonometri-p.png 419w, https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Grafik-Fungsi-Trigonometri-p-300x151.png 300w\" sizes=\"(max-width: 419px) 100vw, 419px\" \/><\/p>\n<p><span style=\"font-weight: 400;\">Perubahan nilai <\/span><em><span style=\"font-weight: 400;\">a<\/span><\/em><span style=\"font-weight: 400;\"> mengakibatkan perubahan amplitudo gelombang. Nah, jika persamaan fungsinya diubah menjadi <\/span><em><span style=\"font-weight: 400;\">y<\/span><\/em><span style=\"font-weight: 400;\"> = sin <\/span><em><span style=\"font-weight: 400;\">bx<\/span><\/em><span style=\"font-weight: 400;\"> dengan <\/span><em><span style=\"font-weight: 400;\">b<\/span><\/em><span style=\"font-weight: 400;\"> = 2, grafiknya akan menjadi seperti berikut.<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-284131\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Grafik-Fungsi-Trigonometri-q.png\" alt=\"\" width=\"368\" height=\"237\" srcset=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Grafik-Fungsi-Trigonometri-q.png 368w, https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Grafik-Fungsi-Trigonometri-q-300x193.png 300w\" sizes=\"(max-width: 368px) 100vw, 368px\" \/><\/p>\n<p><span style=\"font-weight: 400;\">Artinya, perubahan nilai <\/span><em><span style=\"font-weight: 400;\">b<\/span><\/em><span style=\"font-weight: 400;\"> mempengaruhi jumlah gelombang yang terbentuk. Pada grafik fungsi <\/span><em><span style=\"font-weight: 400;\">y<\/span><\/em><span style=\"font-weight: 400;\"> = sin 2<\/span><em><span style=\"font-weight: 400;\">x<\/span><\/em><span style=\"font-weight: 400;\"> terbentuk 2 buah gelombang.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Untuk memudahkan belajarmu, inilah SUPER \u201cSolusi Quipper\u201d.<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-284130\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Grafik-Fungsi-Trigonometri-r.png\" alt=\"\" width=\"530\" height=\"143\" srcset=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Grafik-Fungsi-Trigonometri-r.png 530w, https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Grafik-Fungsi-Trigonometri-r-300x81.png 300w\" sizes=\"(max-width: 530px) 100vw, 530px\" \/><\/p>\n<h3><strong>2. Grafik fungsi kosinus (<\/strong><strong><em>y<\/em><\/strong><strong> = cos 2<\/strong><strong><em>x<\/em><\/strong><strong>, <\/strong><strong><em>x<\/em><\/strong> <strong>\u2208<\/strong><strong> [0<\/strong><sup><strong>o<\/strong><\/sup><strong>, 360<\/strong><sup><strong>o<\/strong><\/sup><strong>])<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">Pada dasarnya, grafik fungsi kosinus sama dengan grafik fungsi sinus. Hal yang membedakan adalah grafik fungsi sinus dimulai dari <\/span><em><span style=\"font-weight: 400;\">y<\/span><\/em><span style=\"font-weight: 400;\"> = 0, sedangkan grafik fungsi kosinus dimulai dari <\/span><em><span style=\"font-weight: 400;\">y<\/span><\/em><span style=\"font-weight: 400;\"> = 1. Perhatikan grafik berikut.<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-284129\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Grafik-Fungsi-Trigonometri-s.png\" alt=\"\" width=\"487\" height=\"263\" srcset=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Grafik-Fungsi-Trigonometri-s.png 487w, https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Grafik-Fungsi-Trigonometri-s-300x162.png 300w\" sizes=\"(max-width: 487px) 100vw, 487px\" \/><\/p>\n<p><span style=\"font-weight: 400;\">Jika persamaan fungsinya diubah menjadi <\/span><em><span style=\"font-weight: 400;\">y<\/span><\/em><span style=\"font-weight: 400;\"> = cos 2<\/span><em><span style=\"font-weight: 400;\">x<\/span><\/em><span style=\"font-weight: 400;\">, grafiknya menjadi seperti berikut.<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-284128\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Grafik-Fungsi-Trigonometri-t.png\" alt=\"\" width=\"427\" height=\"239\" srcset=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Grafik-Fungsi-Trigonometri-t.png 427w, https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Grafik-Fungsi-Trigonometri-t-300x168.png 300w\" sizes=\"(max-width: 427px) 100vw, 427px\" \/><\/p>\n<p><span style=\"font-weight: 400;\">Grafik di atas menujukkan adanya dua buah gelombang yang bergerak dari <\/span><em><span style=\"font-weight: 400;\">y<\/span><\/em><span style=\"font-weight: 400;\"> = 1.<\/span><\/p>\n<h3><strong>3. Grafik fungsi tangen (<\/strong><strong><em>y<\/em><\/strong><strong> = tan <\/strong><strong><em>x<\/em><\/strong><strong>, <\/strong><strong><em>x<\/em><\/strong> <strong>\u2208<\/strong><strong> [<\/strong><strong>0<\/strong><sup><strong>o<\/strong><\/sup><strong>, 360<\/strong><sup><strong>o<\/strong><\/sup><strong>])<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">Adapun ketentuan yang berlaku pada fungsi tangen adalah sebagai berikut.<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Saat <\/span><em><span style=\"font-weight: 400;\">x<\/span><\/em> <span style=\"font-weight: 400;\">-&gt;<\/span><span style=\"font-weight: 400;\"> 90<\/span><sup><span style=\"font-weight: 400;\">o<\/span><\/sup><span style=\"font-weight: 400;\"> dan <\/span><em><span style=\"font-weight: 400;\">x<\/span><\/em> <span style=\"font-weight: 400;\">-&gt;<\/span><span style=\"font-weight: 400;\"> 270<\/span><sup><span style=\"font-weight: 400;\">o<\/span><\/sup><span style=\"font-weight: 400;\"> (dari kanan), nilai <\/span><em><span style=\"font-weight: 400;\">y<\/span><\/em><span style=\"font-weight: 400;\"> = tan <\/span><em><span style=\"font-weight: 400;\">x<\/span><\/em><span style=\"font-weight: 400;\"> menuju tak terhingga.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Saat <\/span><em><span style=\"font-weight: 400;\">x<\/span><\/em> <span style=\"font-weight: 400;\">-&gt;<\/span><span style=\"font-weight: 400;\"> 90<\/span><sup><span style=\"font-weight: 400;\">o<\/span><\/sup><span style=\"font-weight: 400;\"> dan <\/span><em><span style=\"font-weight: 400;\">x<\/span><\/em> <span style=\"font-weight: 400;\">-&gt;<\/span><span style=\"font-weight: 400;\"> 270<\/span><sup><span style=\"font-weight: 400;\">o<\/span><\/sup><span style=\"font-weight: 400;\"> (dari kiri), nilai <\/span><em><span style=\"font-weight: 400;\">y<\/span><\/em><span style=\"font-weight: 400;\"> = tan <\/span><em><span style=\"font-weight: 400;\">x<\/span><\/em><span style=\"font-weight: 400;\"> menuju negatif tak terhingga.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Berikut ini contoh grafiknya.<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-284127\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Grafik-Fungsi-Trigonometri-u.png\" alt=\"\" width=\"427\" height=\"257\" srcset=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Grafik-Fungsi-Trigonometri-u.png 427w, https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Grafik-Fungsi-Trigonometri-u-300x181.png 300w\" sizes=\"(max-width: 427px) 100vw, 427px\" \/><\/p>\n<p><span style=\"font-weight: 400;\">Jika fungsi tangen diubah menjadi <\/span><em><span style=\"font-weight: 400;\">y<\/span><\/em><span style=\"font-weight: 400;\"> = tan 2<\/span><em><span style=\"font-weight: 400;\">x,<\/span><\/em> <em><span style=\"font-weight: 400;\">x<\/span><\/em> <span style=\"font-weight: 400;\">\u2208<\/span><span style=\"font-weight: 400;\"> [0<\/span><sup><span style=\"font-weight: 400;\">o<\/span><\/sup><span style=\"font-weight: 400;\">, 360<\/span><sup><span style=\"font-weight: 400;\">o<\/span><\/sup><span style=\"font-weight: 400;\">] grafiknya menjadi seperti berikut.<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-284126\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Grafik-Fungsi-Trigonometri-v.png\" alt=\"\" width=\"475\" height=\"193\" srcset=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Grafik-Fungsi-Trigonometri-v.png 475w, https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Grafik-Fungsi-Trigonometri-v-300x122.png 300w\" sizes=\"(max-width: 475px) 100vw, 475px\" \/><\/p>\n<p><span style=\"font-weight: 400;\">Untuk mengasah pemahamanmu tentang grafik fungsi trigonometri, simak contoh soal berikut.<\/span><\/p>\n<h2><strong>Contoh Soal 1<\/strong><\/h2>\n<p><span style=\"font-weight: 400;\">Perhatikan grafik fungsi berikut.<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-284125\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Grafik-Fungsi-Trigonometri-w.png\" alt=\"\" width=\"641\" height=\"288\" srcset=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Grafik-Fungsi-Trigonometri-w.png 641w, https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Grafik-Fungsi-Trigonometri-w-300x135.png 300w\" sizes=\"(max-width: 641px) 100vw, 641px\" \/><\/p>\n<p><span style=\"font-weight: 400;\">Grafik fungsi tersebut merupakan grafik fungsi jenis apa?<\/span><\/p>\n<p><strong>Pembahasan:<\/strong><\/p>\n<p><span style=\"font-weight: 400;\">Jika diperhatikan, grafik tersebut dimulai dari titik (0,1) dan mempunyai periode satu putaran 0 \u2264 <\/span><em><span style=\"font-weight: 400;\">x<\/span><\/em><span style=\"font-weight: 400;\"> \u2264 2\u03c0.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Dengan demikian, grafik fungsi tersebut adalah grafik fungsi cos, yaitu <\/span><em><span style=\"font-weight: 400;\">y<\/span><\/em><span style=\"font-weight: 400;\"> = cos <\/span><em><span style=\"font-weight: 400;\">x<\/span><\/em><span style=\"font-weight: 400;\">. Untuk meyakinkan, coba lihat salah satu titiknya.<\/span><\/p>\n<p><span style=\"font-weight: 400;\"> <img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-284124\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Grafik-Fungsi-Trigonometri-x.png\" alt=\"\" width=\"255\" height=\"112\"><\/span><\/p>\n<p><span style=\"font-weight: 400;\">Jadi, grafik fungsi tersebut merupakan grafik fungsi <\/span><em><span style=\"font-weight: 400;\">y <\/span><\/em><span style=\"font-weight: 400;\">= cos <\/span><em><span style=\"font-weight: 400;\">x<\/span><\/em><span style=\"font-weight: 400;\"> untuk 0 \u2264 <\/span><em><span style=\"font-weight: 400;\">x<\/span><\/em><span style=\"font-weight: 400;\"> \u2264 2\u03c0.<\/span><\/p>\n<h2><strong>Contoh Soal 2<\/strong><\/h2>\n<p><span style=\"font-weight: 400;\">Lukislah grafik fungsi <\/span><em><span style=\"font-weight: 400;\">y<\/span><\/em><span style=\"font-weight: 400;\"> = 2 cos 2<\/span><em><span style=\"font-weight: 400;\">x<\/span><\/em><span style=\"font-weight: 400;\">, <\/span><em><span style=\"font-weight: 400;\">x<\/span><\/em> <span style=\"font-weight: 400;\">\u2208<\/span><span style=\"font-weight: 400;\"> [0<\/span><sup><span style=\"font-weight: 400;\">o<\/span><\/sup><span style=\"font-weight: 400;\">, 360<\/span><sup><span style=\"font-weight: 400;\">o<\/span><\/sup><span style=\"font-weight: 400;\">]<\/span><\/p>\n<p><strong>Pembahasan:<\/strong><\/p>\n<p><span style=\"font-weight: 400;\">Untuk menentukan bentuk grafiknya, gunakan tabel trigonometri sudut istimewa.<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-284123\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Grafik-Fungsi-Trigonometri-y.png\" alt=\"\" width=\"563\" height=\"101\" srcset=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Grafik-Fungsi-Trigonometri-y.png 563w, https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Grafik-Fungsi-Trigonometri-y-300x54.png 300w\" sizes=\"(max-width: 563px) 100vw, 563px\" \/><\/p>\n<p><span style=\"font-weight: 400;\">Dengan demikian, grafik fungsi <\/span><em><span style=\"font-weight: 400;\">y<\/span><\/em><span style=\"font-weight: 400;\"> = 2 cos 2<\/span><em><span style=\"font-weight: 400;\">x<\/span><\/em><span style=\"font-weight: 400;\">, <\/span><em><span style=\"font-weight: 400;\">x<\/span><\/em> <span style=\"font-weight: 400;\">\u2208<\/span><span style=\"font-weight: 400;\"> [0<\/span><sup><span style=\"font-weight: 400;\">o<\/span><\/sup><span style=\"font-weight: 400;\">, 360<\/span><sup><span style=\"font-weight: 400;\">o<\/span><\/sup><span style=\"font-weight: 400;\">] adalah sebagai berikut.<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-284122\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Grafik-Fungsi-Trigonometri-z.png\" alt=\"\" width=\"448\" height=\"293\" srcset=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Grafik-Fungsi-Trigonometri-z.png 448w, https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Grafik-Fungsi-Trigonometri-z-300x196.png 300w\" sizes=\"(max-width: 448px) 100vw, 448px\" \/><\/p>\n<h2><strong>Contoh Soal 3<\/strong><\/h2>\n<p><span style=\"font-weight: 400;\">Hitunglah nilai maksimum dan minimum fungsi <\/span><em><span style=\"font-weight: 400;\">y<\/span><\/em><span style=\"font-weight: 400;\"> = cos (<\/span><em><span style=\"font-weight: 400;\">x<\/span><\/em><span style=\"font-weight: 400;\"> \u2013 30), <\/span><em><span style=\"font-weight: 400;\">x<\/span><\/em> <span style=\"font-weight: 400;\">\u2208<\/span><span style=\"font-weight: 400;\"> [0<\/span><sup><span style=\"font-weight: 400;\">o<\/span><\/sup><span style=\"font-weight: 400;\">, 360<\/span><sup><span style=\"font-weight: 400;\">o<\/span><\/sup><span style=\"font-weight: 400;\">]. Kemudian, lukislah grafik fungsinya.<\/span><\/p>\n<p><strong>Pembahasan:<\/strong><\/p>\n<p><span style=\"font-weight: 400;\">Berdasarkan tabel trigonometri untuk sudut istimewa, diperoleh:<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-284121\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Grafik-Fungsi-Trigonometri-a1.png\" alt=\"\" width=\"504\" height=\"114\" srcset=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Grafik-Fungsi-Trigonometri-a1.png 504w, https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Grafik-Fungsi-Trigonometri-a1-300x68.png 300w\" sizes=\"(max-width: 504px) 100vw, 504px\" \/><\/p>\n<p><span style=\"font-weight: 400;\">Berdasarkan tabel di atas, nilai maksimum dari fungsi <\/span><em><span style=\"font-weight: 400;\">y<\/span><\/em><span style=\"font-weight: 400;\"> = cos (<\/span><em><span style=\"font-weight: 400;\">x<\/span><\/em><span style=\"font-weight: 400;\"> \u2013 30),<\/span><em><span style=\"font-weight: 400;\"> x<\/span><\/em> <span style=\"font-weight: 400;\">\u2208<\/span><span style=\"font-weight: 400;\"> [0<\/span><sup><span style=\"font-weight: 400;\">o<\/span><\/sup><span style=\"font-weight: 400;\">, 360<\/span><sup><span style=\"font-weight: 400;\">o<\/span><\/sup><span style=\"font-weight: 400;\">] adalah 1 dan nilai minimumnya adalah \u20131. Untuk lebih jelasnya, simak grafik fungsi berikut.<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-284120\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Grafik-Fungsi-Trigonometri-a2.png\" alt=\"\" width=\"413\" height=\"186\" srcset=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Grafik-Fungsi-Trigonometri-a2.png 413w, https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Grafik-Fungsi-Trigonometri-a2-300x135.png 300w\" sizes=\"(max-width: 413px) 100vw, 413px\" \/><\/p>\n<p><span style=\"font-weight: 400;\">Itulah pembahasan Quipper Blog tentang grafik fungsi trigonometri. Semoga bermanfaat buat Quipperian. Jika Quipperian ingin melihat pembahasan lengkapnya, silakan buka akun <a href=\"https:\/\/subscribe.quipper.com\/signup\/id\"><strong>Quipper Video<\/strong><\/a>-nya, ya. So, tunggu apa lagi. Salam Quipper!<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><strong>Penulis: Eka Viandari<\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Hai Quipperian, bagaimana kabarnya? Semoga selalu sehat dan tetap semangat belajar, ya. Pada pertemuan ini, Quipper Blog akan mengajak Quipperian untuk belajar tentang grafik&hellip;<\/p>\n","protected":false},"author":99400369,"featured_media":284152,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_crdt_document":"","_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[679384888,679384865],"tags":[],"ppma_author":[679386827,679386836],"class_list":["post-284118","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-mapel","category-matematika"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Grafik Fungsi Trigonometri - Matematika Kelas 10 - Quipper Blog<\/title>\n<meta name=\"description\" content=\"Yuk, Quipperian, belajar tentang grafik fungsi trigonometri kelas 10 lewat ulasan lengkap Quipper Blog ini!\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.quipper.com\/id\/blog\/mapel\/matematika\/grafik-fungsi-trigonometri-matematika-kelas-10\/\" \/>\n<meta property=\"og:locale\" content=\"id_ID\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Grafik Fungsi Trigonometri - Matematika Kelas 10 - Quipper Blog\" \/>\n<meta property=\"og:description\" content=\"Yuk, Quipperian, belajar tentang grafik fungsi trigonometri kelas 10 lewat ulasan lengkap Quipper Blog ini!\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.quipper.com\/id\/blog\/mapel\/matematika\/grafik-fungsi-trigonometri-matematika-kelas-10\/\" \/>\n<meta property=\"og:site_name\" content=\"Quipper Blog\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/QuipperVideoID\/\" \/>\n<meta property=\"article:published_time\" content=\"2020-08-26T14:16:50+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2023-02-07T08:45:41+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Grafik-Fungsi-Trigonometri-1.png\" \/>\n\t<meta property=\"og:image:width\" content=\"800\" \/>\n\t<meta property=\"og:image:height\" content=\"533\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"sereliciouz, Pamela Natasa, S.Pd.\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@quipper_id\" \/>\n<meta name=\"twitter:site\" content=\"@quipper_id\" \/>\n<meta name=\"twitter:label1\" content=\"Ditulis oleh\" \/>\n\t<meta name=\"twitter:data1\" content=\"sereliciouz\" \/>\n\t<meta name=\"twitter:label2\" content=\"Estimasi waktu membaca\" \/>\n\t<meta name=\"twitter:data2\" content=\"10 menit\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.quipper.com\\\/id\\\/blog\\\/mapel\\\/matematika\\\/grafik-fungsi-trigonometri-matematika-kelas-10\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/quipperhome.wpcomstaging.com\\\/mapel\\\/matematika\\\/grafik-fungsi-trigonometri-matematika-kelas-10\\\/\"},\"author\":{\"name\":\"sereliciouz\",\"@id\":\"https:\\\/\\\/quipperhome.wpcomstaging.com\\\/#\\\/schema\\\/person\\\/b08224c7b72a87b156db30c3b032083b\"},\"headline\":\"Grafik Fungsi Trigonometri &#8211; 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