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let-give-x-lt-1-prove-that-n-1-x-n-cos-n-xcos-x-2-1-2xcos-x-2-

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Question Number 32934 by abdo imad last updated on 06/Apr/18
let give ∣x∣<1 prove that Σ_(n=1) ^∞ x^n cos(nθ)= ((xcosθ −x^2 )/(1−2xcosθ +x^2 ))
letgive∣x∣<1provethat∑n=1∞xncos(nθ)=xcosθ−x21−2xcosθ+x2

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