Find the derivative.y = 9 sin 5x cos x
A. 9 sin 5x sin x + 45 cos x cos 5x
B. sin 5x sin x + 45 cos x cos 5x
C. -9 sin 5x sin x + 45 cos x cos 5x
D. -9 sin 5x sin x + cos x cos 5x
Answer: C
Mathematics
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