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If y = cos 3x, find δyδx

A. 13sin3x
B. −13sin3x
C. 3 sin 3x
D. -3 sin 3x

1 answer

We start by using the chain rule.

The derivative of the cosine function is the negative sine function. So, the derivative of y = cos 3x with respect to x is:

dy/dx = -sin 3x

Therefore, the answer is D. -3sin3x
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