$\cot^{-1}\left(\frac{-1}{\sqrt{3}}\right)$ का मुख्य मान . . . . . . के बराबर है।

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

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