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Question Number 134809 by liberty last updated on 07/Mar/21
Show if f ′′(a) exist then   f ′′(a)=lim_(h→0)  ((f(a+h)+f(a−h)−2f(a))/h^2 )
Showiff(a)existthenf(a)=limh0f(a+h)+f(ah)2f(a)h2

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