Show your intermediary steps in finding the derivatives in what follows. (Do not use a calculator in solving the following.) (a) Let f(x) = x . sec(x) - 3,x + 7. Find f"(x). (b) Let f(x) = xe* + x + sin(x). Find dx-3 x+2 x2 - 3x (c) Let f(x) = + . Find f'(x). 5x2 + 1 x7 + 5