1. Use the first principles of differentiation to determine f'(x) for the following functions: (a) f(x)=3x2 -4x+1 (5) ( b ) f (x ) = 2x +1 x+3 (5) (c) f (x ) = 4 x (5) 2. By using the first principles of differentiation, find the following: (a) f(x) = 1-x 2+ x (3) (b) f' (- 3) (2)