Answer
$$\frac{dy}{dx}=\sin(\cos x)\sin x$$
Work Step by Step
$$\frac{dy}{dx}=(\cos(\cos x))'=-\sin(\cos x)\cdot(\cos x)'=-\sin(\cos x)\cdot(-\sin x)=\sin(\cos x)\sin x$$
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.