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

           .....nice    calculus.....       calculate ::       lim_(n→∞) (1/( (√n))) Σ_(k=1 ) ^n cos^(2n) (((kπ)/n))=??

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

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