12. Functions f, g, and h are twice-differentiable functions with g(1) = h(1) = 5. The line y = 5 + =(x - 1) is tangent to both the graph of g at x = 1 and the graph of hat x = 1. (a) Find g'(1). (b) Let b be the function given by b(x) = 2x2g(x). Write an expression for b'(x). Find b'(1). (c) Let w be the function given by w(x) ="h(x)-x 2x+1 . Write an expression for w'(x). Find w'(1)