If $y = \sin(\cos x)$, then $\dfrac{dy}{dx}$ equals:
- $-\cos(\cos x) \cdot \sin(\cos x)$
- $-\sin x \cos(\cos x)$
- $\sin x \cdot \cos(\cos x)$
- $\cos(\cos x)$
Show answer and solution
Correct answer: B. $-\sin x \cos(\cos x)$
Chain rule: $dy/dx = \cos(\cos x) \cdot d/dx(\cos x) = \cos(\cos x) \cdot (-\sin x) = -\sin x \cos(\cos x)$.