For the following exercises, the given limit represents the derivative of a function y= f(x) at x a. Find f(x) and a. 2 (1 + h)3-1 lim h→0 h For the following exercises, the given limit represents the derivative of a function y= f(x) at x = a. Find f(x) and a. lim h→0 cos(π + h) +1 h