$\tan ^{-1}\left(\tan \frac{5 \pi}{6}\right)+\cos ^{-1}\left(\cos \frac{13 \pi}{6}\right) = $

  • A
    $0$
  • B
    $3 \pi$
  • C
    $-\frac{\pi}{6}$
  • D
    $\frac{\pi}{6}$

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