Let f(x) be given below by its graph. Find and classify all points of discontinuity. Explain your answer briefly. 41 0 | -4 -2 0 2 - -2 Q2 (3 points) Let a be a nonzero real number. Show that the function g(x) (ax)4 cos (#) if x # 0 0 if x = 0 is continuous on (-0o, co)