2. Find the derivative of the following function y(x) = a³ + 3 cos³(x). (A) 3a²-9 cos²(x) sin(x) (B) -9 cos²(x) sin(x) (C) 3a²-9 cos²(x) (D) 9 cos²(x) sin(x) (E) -9 cos²(x) (f) 9 cos²(x)