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It requires that f(a)=f(b) where a and b are beginning and ending points. Also, it says there is a c between a and such that f'(c)=0. If f were not differentiable on the open interval, the statement f'(c)=0 would be invalid.

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Q: Why in rolles theorem closed interval is used for contuinity and open interval is used for differentiability?
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