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

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

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