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let-give-x-lt-1-prove-that-n-1-sin-n-n-x-n-arctan-xsin-1-xcos-

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Question Number 32937 by abdo imad last updated on 06/Apr/18
let give ∣x∣<1 prove that Σ_(n=1) ^∞ ((sin(nθ))/n) x^n =arctan( ((xsinθ)/(1−xcosθ))) .
letgive∣x∣<1provethat∑n=1∞sin(nθ)nxn=arctan(xsinθ1−xcosθ).

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