Suppose f is a one-to-one, differentiable function and its inverse function f is also differentiable. One can show, using implicit differentiat (do it!), that ( f - 1 ) ' (20 ) = fi (f - 1 ( 20 ) ) Find (f-1)'(4) if f(1) = 4 and f' (1) = 3/11. ( f-1)' (4 ) =