Second derivative chain rule
= Second derivative chain rule
For twice differentiable functions,
$$
(g\circ f)''(a)
=g''(f(a))[f'(a)]^2+g'(f(a))f''(a).
$$
= Second derivative chain rule
For twice differentiable functions,
$$
(g\circ f)''(a)
=g''(f(a))[f'(a)]^2+g'(f(a))f''(a).
$$