Let f (x) = -2 sin(8 x). Answer the following. (Exact answers only: decimal approximations will be marked incorrect.) (a) Determine the coordinates of the first maximum turning point on the graph of f(x) in the interval (0,21). First Max Turning Point: X = y = X X (b) Determine the coordinates of the first minimum turning point on the graph of f(x) in the interval (0,27). First Min Turning Point: X = y X X