Chain rule
= Chain rule
{wiki}
If $f$ is differentiable at $a$ and $g$ is differentiable at $f(a)$, then
$$
(g\circ f)'(a)=g'(f(a))f'(a).
$$
= Chain rule
{wiki}
If $f$ is differentiable at $a$ and $g$ is differentiable at $f(a)$, then
$$
(g\circ f)'(a)=g'(f(a))f'(a).
$$