જો $\mathop {\lim }\limits_{n \to \infty } n \cos \left( \frac{\pi }{4n} \right) \sin \left( \frac{\pi }{4n} \right) = k$ હોય,તો $k$ ની કિંમત શોધો.

  • A
    $\frac{\pi }{4}$
  • B
    $\frac{\pi }{3}$
  • C
    $\pi $
  • D
    આમાંથી કોઈ નહીં

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