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∫cos 4x cos x dx = ? A. 1/5sin 5x + 1/3sin 3x + C B. 1/5cos 5x - 1/3 cos 3x + C

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∫cos 4x cos x dx = ?

A. 1/5sin 5x + 1/3sin 3x + C

B. 1/5cos 5x - 1/3 cos 3x + C

C. 1/10sin 5x + 1/6sin 3x + C

D. None of these

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Given:

= \(\frac{sin\,5x}{10}+\frac{sin\,3x}{6}+c\)

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