$\tan ^{-1} x+2 \cot ^{-1} x=\frac{2 \pi}{3}$ का हल है

  • A
    $-\frac{1}{\sqrt{3}}$
  • B
    $\frac{1}{\sqrt{3}}$
  • C
    $-\sqrt{3}$
  • D
    $\sqrt{3}$

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