sin 5x = sin 5/6π 0 ≤ x ≤ 2π

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Sin 5x = sin 5/6π 0 ≤ x ≤ 2π

Jawaban dan Penjelasan

Berikut ini adalah pilihan jawaban terbaik dari pertanyaan diatas.

Diketahui persamaan trigonometri \sin 5x= \sin \frac{5}{6} \pi ,\: 0\leq x\leq 2\pi. Himpunan penyelesaiaannya adalah =\{\frac{\pi}{6}, \frac{\pi}{30}, \frac{13\pi}{30}, \frac{17\pi}{30} , \frac{25\pi}{30} ,\frac{29\pi}{30}, \frac{37\pi}{30}, \frac{41\pi}{30}, \frac{49\pi}{30},\frac{53\pi}{30}\}

Penjelasan dengan langkah-langkah:

Diketahui:

\sin 5x= \sin \frac{5}{6} \pi ,\: 0\leq x\leq 2\pi

Ditanya:

Nilai x yang memenuhi persamaan trigonometri

Pembahasan:

Untuk persamaan trigonometri bentuk \sin x = \sin \alpha, maka penyelesaiannya adalah

x=\alpha +k.2\pi\\\text{atau}\\x=(\pi - \alpha )+k.2\pi

Terlebih dahulu sederhanakan persamaan

5x=\frac{5}{6} \pi+k.2\pi \\x=\frac{\pi }{6}+k.\frac{2}{5}\pi \\\\5x=(\pi-\frac{5}{6}) \pi+k.2\pi \\5x=\frac{\pi }{6}+k.2\pi \\x=\frac{\pi }{30}+k.\frac{2}{5}\pi

  • x=\frac{\pi }{6}+k.\frac{2}{5}\pi

- k = 0

x=\frac{\pi }{6}+0.\frac{2}{5}\pi\\x=\frac{\pi}{6}

- k = 1

x=\frac{\pi }{6}+1.\frac{2}{5}\pi\\x=\frac{\pi}{6} +\frac{2\pi}{5}\\x=\frac{5\pi+12\pi}{30} \\x=\frac{17\pi}{30}

- k = 2

x=\frac{\pi }{6}+2.\frac{2}{5}\pi\\x=\frac{\pi}{6} +\frac{4\pi}{5}\\x=\frac{5\pi+24\pi}{30} \\x=\frac{29\pi}{30}

- k = 3

x=\frac{\pi }{6}+3.\frac{2}{5}\pi\\x=\frac{\pi}{6} +\frac{6\pi}{5}\\x=\frac{5\pi+36\pi}{30} \\x=\frac{41\pi}{30}

- k = 4

x=\frac{\pi }{6}+4.\frac{2}{5}\pi\\x=\frac{\pi}{6} +\frac{8\pi}{5}\\x=\frac{5\pi+48\pi}{30} \\x=\frac{53\pi}{30}

- k = 5

x=\frac{\pi }{6}+5.\frac{2}{5}\pi\\x=\frac{\pi}{6} +\frac{10\pi}{5}\\x=\frac{5\pi+60\pi}{30} \\x=\frac{65\pi}{30}

(tidak memenuhi)

  • x=\frac{\pi }{30}+k.\frac{2}{5}\pi

- k = 0

x=\frac{\pi }{30}+0.\frac{2}{5}\pi\\x=\frac{\pi}{30}

- k = 1

x=\frac{\pi }{30}+1.\frac{2}{5}\pi\\x=\frac{\pi}{30} +\frac{2\pi}{5}\\x=\frac{\pi+12\pi}{30} \\x=\frac{13\pi}{30}

- k = 2

x=\frac{\pi }{30}+2.\frac{2}{5}\pi\\x=\frac{\pi}{30} +\frac{4\pi}{5}\\x=\frac{\pi+24\pi}{30} \\x=\frac{25\pi}{30}

- k = 3

x=\frac{\pi }{30}+3.\frac{2}{5}\pi\\x=\frac{\pi}{30} +\frac{6\pi}{5}\\x=\frac{\pi+36\pi}{30} \\x=\frac{37\pi}{30}

- k = 4

x=\frac{\pi }{30}+4.\frac{2}{5}\pi\\x=\frac{\pi}{30} +\frac{8\pi}{5}\\x=\frac{\pi+48\pi}{30} \\x=\frac{49\pi}{30}

- k = 5

x=\frac{\pi }{30}+5.\frac{2}{5}\pi\\x=\frac{\pi}{30} +\frac{10\pi}{5}\\x=\frac{\pi+60\pi}{30} \\x=\frac{61\pi}{30}

(tidak memenuhi)

Himpunan penyelesaiaan: =\{\frac{\pi}{6}, \frac{\pi}{30}, \frac{13\pi}{30}, \frac{17\pi}{30} , \frac{25\pi}{30} ,\frac{29\pi}{30}, \frac{37\pi}{30}, \frac{41\pi}{30}, \frac{49\pi}{30},\frac{53\pi}{30}\}

Pelajari lebih lanjut:

Materi tentang persamaan trigonometri: yomemimo.com/tugas/12323357

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Last Update: Sat, 29 Oct 22