## Calculus 8th Edition

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