Question

Suppose you know that f(u) is a function with derivative f’(u). Then the derivative with respect to t, of the composite function f(ln(kt)) is what? A. f’(1/(kt)) B. (f’(ln(kt)))/t C. f’(1/t) D. (f’(ln(kt)))/kt E. None

Answer 1

using the chain rule, that would mean
df/dt = df/du * du/dt = f'(ln(kt)) * 1/t
so, B