Chain Rule With a Cosine Function

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What is the derivative of the function $f(x)=\cos(2*x)$ ?

The derivative is $\sin(2*x)$ .

The derivative is $-\sin(2*x)$ , neglecting the derivative of the inner function.

The derivative is $-2*\sin(2*x)$ .

The derivative is $-2*\cos(2*x)$ .

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