5. There is a function h, where h = gof. f(x) = Ax B 3 - g(x) = x + Dx You already know about the chain rule: h' (x) = g'(f(x))f'(x). Verify, by taking the derivatives using your ABCD, whether the chain rule applies on second derivatives, too. (Tip: change the "prime" to "double prime" in the equation above.)