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find-the-value-of-n-1-cos-npix-n-2-with-0-lt-x-lt-1-

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Question Number 28879 by abdo imad last updated on 31/Jan/18
find the value of Σ_(n=1) ^(+∞) ((cos(nπx))/n^2 ) with 0<x<1.
findthevalueof∑n=1+∞cos(nπx)n2with0<x<1.

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