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Pertanyaan

Penyelesaian dari 2 ( cos ( x − 1 0 o )) − 1 = 0 untuk 0 < x < 90 adalah ....

Penyelesaian dari  untuk  adalah ....

  1. 20 to the power of o

  2. 30 to the power of o

  3. 40 to the power of o

  4. 50 to the power of o

  5. 70 to the power of o

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N. Rahayu

Master Teacher

Mahasiswa/Alumni Universitas Negeri Jakarta

Jawaban terverifikasi

Pembahasan

2 space left parenthesis cos space left parenthesis x minus 10 to the power of o space right parenthesis right parenthesis minus 1 equals 0 space ⟺ space 2 space left parenthesis cos space left parenthesis x minus 10 to the power of o space right parenthesis right parenthesis equals 1 space ⟺ cos space left parenthesis x minus 10 to the power of o space right parenthesis equals 1 divided by 2 space space ⟺ cos space left parenthesis x minus 10 to the power of o space right parenthesis equals cos space 60 to the power of o space space ⟺ x minus 10 to the power of o equals plus-or-minus space 60 to the power of o plus k. space 360 to the power of o space space ⟺ x minus 10 to the power of o equals negative space 60 to the power of o plus k. space 360 to the power of o space ⟺ space x equals negative 50 to the power of o plus k. space 360 to the power of o space u n t u k space k equals 1 ⟺ x equals 310 to the power of o space left parenthesis t i d a k space m e m e n u h i right parenthesis space s e d a n g k a n space u n t u k space colon space ⟺ x minus 10 to the power of o equals 60 to the power of o plus k. space 360 to the power of o space ⟺ space x equals 70 to the power of o plus k. space 360 to the power of o space u n t u k space k equals 0 ⟺ x equals 70 to the power of o space J a d i comma space p e n y e l e s a i a n n y a space a d a l a h space 70 to the power of o

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Himpunan penyelesaian persamaan cos 2x + cos x = 0, 0° ≤ x ≤ 180° adalah ....

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