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Question Number 136093 by mnjuly1970 last updated on 18/Mar/21

$$.....nicecalculus.....$$$$calculate::$$$${lim}_{n\to \mathrm{\infty }}\frac{1}{\sqrt{n}}\underset{k=1}{\sum ^n}{cos}^{2n}\left(\frac{k\pi }{n}\right)=??$$$$$$

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