જો $2 \tan^{-1}(\cos x) = \tan^{-1}(2 \operatorname{cosec} x)$ હોય,તો $x$ ની કિંમત શોધો.

  • A
    $-\frac{\pi}{4}$
  • B
    $0$
  • C
    $\frac{\pi}{8}$
  • D
    $\frac{\pi}{4}$

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$\cos ^{-1}\left(\frac{1}{2}\right)+2 \sin ^{-1}\left(\frac{1}{2}\right)$ ની કિંમત શોધો.

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