सीमा का मान ज्ञात कीजिए: $\mathop {\lim}\limits_{n \to \infty } \frac{\pi }{2n} \left( 1 + \cos \frac{\pi }{2n} + \cos \frac{2\pi }{2n} + \dots + \cos \frac{(n - 1)\pi }{2n} \right)$

  • A
    $1$
  • B
    $\frac{1}{2}$
  • C
    $2$
  • D
    इनमें से कोई नहीं

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