nice-calculus-calculate-lim-n-1-n-k-1-n-cos-2n-kpi-n-

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

\dots . . n i c e c a l c u l u s \dots . .

c a l c u l a t e ::

{l i m}_{n \to \infty} \frac{1}{\sqrt{n}} \underset{k = 1}{\sum^{n}} {c o s}^{2 n} (\frac{k π}{n}) = ? ?