a 1. (20 marks) Let a
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a 1. (20 marks) Let a
a 1. (20 marks) Let a <b. Suppose a function f is defined on [a, b] and the derivative f'(x) exists for all 1 [a, b]. If f'(a) < 0 and f'(6) > 0. Show that there exists a point c, a<c<b, such that f'(c) = 0. =
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