find sum of S(x)= Σ_(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

$f i n d s u m o f S (x) = \sum_{n = 1}^{\infty} {(- 1)}^{n - 1} \frac{x^{2 n + 1}}{4 n^{2} - 1} .$
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