Turn in the following problems: 1. Find y' if arctan (ary) = 1+czy. 2. (a) Suppose f is a one-to-one differentiable function and its inverse function f is also differentiable. Use implicit differentiation to show that 1 ( f ) ( I) = F(f (I) ) provided that the denominator is not 0. (b) If f(4) = 5 and f'(4) = 3, find (f )