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  3. 417 let f a b r be differentiable...

Question: 417 let f a b r be differentiable...

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4-17· Let f : [a, b] → R be differentiable on the open interval (a, b) and continuous on the closed interval [a, b]. Prove that if f,(x) = 0 for all x E (a, b), then f is constant on [a, b].
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