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

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

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