3. Use the chain rule to find derivatives in each of the following: (a) (b) 3 1 f x 3 2 x 2 1 3x 2 x 4 f x 2x 3 (c) f x 6 x 3 / 2 2 x1 / 2 4. Find derivatives of the following functions (a) y 4 x 2 ln 2 x 4 (b) f x x 2 3 e 5 x (c) y e 3x e 3x 4x 3