if d/dx(f(x)) = g(x) and d/dx(g(x)) = f(x^2), then d^2/dx^2 ( f(x^3) ) = ?
The Attempt at a Solution
from 1 and 2 we get d.dx(g(x)) = d2/dx2(f(x)) = f(x^2)
but then what? That doesn't tell me anything about f(x^3)