Answer
$f'(x) = g'(x) * cos(g(x)) $
Work Step by Step
$f(x) = sin(g(x))$
Use chain rule here
$f'(x) = \frac{d}{dx} sin(g(x))$
$f'(x) = cos(g(x)) \frac{d}{dx} (g(x))$
$f'(x) = g'(x) * cos(g(x)) $
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