73. Let f be differentiable at every value of x and suppose that f(1) = 1, that f' < 0 on (-x, 1), and that f' > 0 on (1, o). a. Show that f(x) > 1 for all x. b. Must f'(1) = 0? Explain.

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Q: 3. Proof that f (x) = x sin is continuos but is not differentiable at 0

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