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Question Number 141632 by Willson last updated on 21/May/21
Let f(x)=((sin(x))/x) , prove that : Σ_(n=0) ^∞ [ f(nπ+α)+f(nπ−α) ]= 1+f(α)
Letf(x)=sin(x)x,provethat:∑∞n=0[f(nπ+α)+f(nπ−α)]=1+f(α)

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