Consider the equation below. (if an answer does not exist, enter dne.) f(x) = 8 cos2(x) − 16 sin(x), 0 ≤ x ≤ 2π (a) find the interval on which f is increasing. (enter your answer using interval notation.) correct: your answer is correct. find the interval on which f is decreasing. (enter your answer using interval notation.) correct: your answer is correct. (b) find the local minimum and maximum values of f. local minimum value correct: your answer is correct. local maximum value correct: your answer is correct.