166 CHAPTER 2 Limits and Derivatives 64. Find f'(0) and f'-(0) for the given function f. Is f differen- tiable at 0? (0 if x <0 f(x) = [x if x > 0 (a) (o if x<0 f(x) = x? if x> 0 (b) 65. Let if x<0 if 0 4 (a) Find f'-(4) and f'4(4). (b) Sketch the graph of f. (c) Where is ƒ discontinuous? (d) Where is f not differentiable?

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