જો $\operatorname{cosec} \theta + \cot \theta = 5$ હોય,તો $\sin \theta = $

  • A
    $\frac{1}{5}$
  • B
    $\frac{5}{26}$
  • C
    $\frac{5}{13}$
  • D
    $\frac{1}{13}$

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$\sum_{k=1}^3 \cos ^2\left((2 k-1) \frac{\pi}{12}\right)$ ની કિંમત શોધો.

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