4. (3 points) Find the first and second derivatives of f(x) = 3el sin r - r Inr , simplifying where possible. 5. (9 points) Find the (first) derivatives of the following, simplifying where possible: (a) f(x) = (12 + 3)3 (71 + 1)4 (b) y = sin t (c) g(z) = 5sec?(re3z)