f continuous on [a,b] and differentiable on (a,b)




Why do many theorems in calculus/analysis have the hypotheses, f
continuous on [a,b] and differentiable on (a,b)?

My question is really why the endpoints are not included for the
differentiable hypothesis. Aren't functions that are continous on
[a,b] and differentiable on (a,b) also differentiable from one side at
the endpoints?

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