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find-sum-of-S-x-n-1-1-n-1-x-2n-1-4n-2-1-

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Question Number 28684 by abdo imad last updated on 28/Jan/18
find sum of S(x)= Σ_(n=1) ^∞ (−1)^(n−1) (x^(2n+1) /(4n^2 −1)) .
findsumofS(x)=∑n=1∞(−1)n−1x2n+14n2−1.

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