Find the critical points of the function and use the First Derivative Test to determine whether the critical point is a local minimum or maximum (or neither). (Enter your answers as a comma-separated list. If an answer does not exist, enter DNE.) f(x) = 5e−x cos(x), on − π 2 , π 2 local minimum c = Incorrect: Your answer is incorrect. local maximum c = Incorrect: Your answer is incorrect. Determine the intervals on which the function is increasing or decreasing. (Enter your answers using interval notation. Enter EMPTY or ∅ for the empty set.) increasing decreasing