Consider the following. Function f(x) = 9 cos 2x Trigonometric Equation -18 sin 2x = 0 (a) Use a graphing utility to graph the function f(x) and approximate the maximum and minimum points (to four decimal places) of the graph in the interval [0,2]. (x, y) = ([0,9 (smallest x-value) (x, y) = ( [2,9 (x, y) = 4x,9 (x, y) = π, - 9 (x, y) = (3π, -9 × (largest x-value) (b) Solve the trigonometric equation and verify that the x-coordinates of the maximum and minimum points of f are among its solutions (the trigonometric equation is found using calculus. Only consider the x-coordinates in the interval [0,2]. Enter your answers as a comma-separated list.) x = 0, л, 2, 3, 4л