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80 Chapter 2 Limits and Their Properties x - 21 27. lim 4 x42 x - 2 28. lim x-+02 + el/x w 3- 2 3 4 5 -2 -3 29. lim cos = 30. lim tan X 1-+0 X x-+1/2 - - . Na Graphical Reasoning In Exercises 31 and 32, use the graph of the function f to decide whether the value of the given quantity exists. If it does, find it. If not, explain why. 31. (a) f(1) (b) lim f(x) r-1 (c) f(4) (d) lim f(x) r-4 x 12 3 4 5 6 32. (a) f(-2) (b) lim f(x) x4-2 (c) f(0) (d) lim f(x) run (e) f(2) 1 2 34 5 (f) lim f(x) (g) f(4) (h) lim f(x) x-+4