1. (9 points) Find f'(x) for the following functions by computing the limit lim f(x th) - f(x) h-+0 h (a). f(x) = 12 + 20: +5 (b). f(x) =- Find f'(x) by using an alternate definition of the derivative f'(x) = lim : f(2) - f(x) (c). f(x) = v5x (hint: 2 -= = (v2 -VI)(v3+ vi))