$\operatorname{cosec}^{-1}(\sqrt{2})+\cos ^{-1}\left(\frac{-1}{2}\right)-\sec ^{-1}\left(\frac{2}{\sqrt{3}}\right)$ का मान किसके बराबर है?

  • A
    $\frac{3 \pi}{4}$
  • B
    $\frac{\pi}{6}$
  • C
    $\frac{2 \pi}{3}$
  • D
    $\frac{\pi}{4}$

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