Sketch the graph of f sin x x 0 f x 9 9 cos x 0 x cos x X y 201 2 15 10 y 20 15 10 S A 37 2 2 Identify the values of c for which lim f x exists x c O The limit exists at all points on the graph except where c x O The limit exists at all points on the graph O The limit exists at all points on the graph except where c 18 The limit exists at all points on the graph except where c 0 and c 20 15 10 5 y y 20 15 10 X 3r 2 x