$\sin ^{-1}\left(-\frac{1}{2}\right)+\cos ^{-1}\left(\frac{\sqrt{3}}{2}\right)=$ . . . . . . .

  • A
    $\frac{\pi}{2}$
  • B
    $\pi$
  • C
    $\frac{5 \pi}{6}$
  • D
    $0$

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