$\tan^{-1}(-2) - \tan^{-1}(3)$ is equal to

  • A
    $\frac{3 \pi}{4}$
  • B
    $\frac{-\pi}{6}$
  • C
    $\frac{\pi}{6}$
  • D
    $\frac{-3 \pi}{4}$

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