Define differentiability of a function at a point.
Let f(x) be a real valued function defined on an open interval (a, b) and let c € (a, b), then f(x) is said to be differentiable at x = c iff
exists finitely or 
.
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Define differentiability of a function at a point.
Let f(x) be a real valued function defined on an open interval (a, b) and let c € (a, b), then f(x) is said to be differentiable at x = c iff
exists finitely or .