$\tan ^{-1}(-1)+\sec ^{-1}(-2)+\sin ^{-1} \frac{1}{\sqrt{2}}$ का मान . . . . . . है।

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

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