QuestionFind the rate of change of $y=\cos 5 x$. Choices: A. $\sin 5 x$, B. $5 \sin 5 x$, C. $-\sin 5 x$, D. $-5 \sin 5 x$.

Studdy Solution
Finally, replace $u$ with $5x$ to get the derivative of the original function.
$$\frac{dy}{dx} = -5 \sin5x$$Therefore, the rate of change of $y=\cos5x$ is $-5 \sin5x$.