લક્ષની કિંમત શોધો: $\mathop {\lim}\limits_{n \to \infty } \frac{\pi }{2n} \left( 1 + \cos \frac{\pi }{2n} + \cos \frac{2\pi }{2n} + \dots + \cos \frac{(n - 1)\pi }{2n} \right)$

  • A
    $1$
  • B
    $\frac{1}{2}$
  • C
    $2$
  • D
    આમાંથી કોઈ નહીં

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ધારો કે $S_n = \sum_{k=1}^n \frac{n}{n^2+kn+k^2}$ અને $T_n = \sum_{k=0}^{n-1} \frac{n}{n^2+kn+k^2}$ જ્યાં $n=1, 2, 3, \ldots$ છે. તો,

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