$\lim _{n \rightarrow \infty} \frac{1}{n} \left\{ \sec ^{2} \frac{\pi}{4 n} + \sec ^{2} \frac{2 \pi}{4 n} + \ldots + \sec ^{2} \frac{n \pi}{4 n} \right\}$ ની કિંમત શોધો.

  • A
    $\log _{e} 2$
  • B
    $\frac{\pi}{2}$
  • C
    $\frac{4}{\pi}$
  • D
    $e$

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