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Please solve RD Sharma class 12 chapter 9 Differentiability exercise Very short answer type question  1 maths textbook solution

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Differentiability of a function at a point:

letf(x) be a real valued function defined on an open interval (a,b) and c \in(a, b)

then f(x) is said to be differentiable at a point if  \lim _{x \rightarrow c} \frac{f(x)-f(c)}{x-c}exists finitely.

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