# Calculate second order derivative

Calculate f" for f(x)=g(e^(2x)), where g is a function defined for all real numbers & g admits second order derivative.

please check if I did it right.
f = g(e2x)
f' = 2e2x g'
f'' = 4e2xg' + 2e2xg''

I have expanded out

4e2xg'(u) + 2e2xg''(u)

mathman