$\int_{\frac{\pi}{6}}^{\frac{\pi}{2}} \frac{\operatorname{cosec} x \cdot \cot x}{1+\operatorname{cosec}^2 x} d x=$

  • A
    $\frac{\pi}{4}-\tan ^{-1} 2$
  • B
    $\tan ^{-1} 1$
  • C
    $\tan ^{-1} 2$
  • D
    $\tan ^{-1}\left(\frac{1}{3}\right)$

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