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Question: help with 16 please...

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help with #16 please.

oJx)) Whefé d 2 to 2 b. Show that there exists a point c e (a, b) such that f(c) 0. 16. Let I c R be an open interval, let f : 1-R be differentiable on I, and suppose f(a) exists at a E I. Show that f(a + h)-2f(a) +f(a-h) 産 j ( a) = lim 1--0 Give an example where this limit exists, but the function does not have a second derivative at a.

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