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Tentukan himpunan penyelesaian dari persamaan -persamaan trigonometri berikut! a cos6x=sinx,0leqslant xleqslant 2pi Jawab: __
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Tentukan himpunan penyelesaian dari persamaan -persamaan trigonometri berikut! a cos6x=sinx,0leqslant xleqslant 2pi Jawab: __

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Ojasvat ahli · Tutor selama 3 tahun

Jawaban

a. \( x = \frac{3\pi}{2} \), \( x = \frac{11\pi}{10} \), \( x = \frac{19\pi}{10} \), \( x = \frac{3\pi}{10} \), \( x = \frac{7\pi}{10} \)


Penjelasan

Untuk menyelesaikan persamaan trigonometri \( \cos(6x) = \sin(x) \) dalam rentang \( 0 \leq x \leq 2\pi \), kita dapat menggunakan identitas trigonometri dasar. Dengan mengganti \( \sin(x) \) dengan \( \cos\left(\frac{\pi}{2} - x\right) \), persamaan menjadi \( \cos(6x) = \cos\left(\frac{\pi}{2} - x\right) \). Dari sini, kita dapat menemukan solusi persamaan tersebut. Solusi yang ditemukan adalah \( x = \frac{3\pi}{2} \), \( x = \frac{11\pi}{10} \), \( x = \frac{19\pi}{10} \), \( x = \frac{3\pi}{10} \), dan \( x = \frac{7\pi}{10} \). Solusi-solusi ini merupakan nilai-nilai \( x \) di mana kedua fungsi trigonometri tersebut bernilai sama dalam rentang yang ditentukan.

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