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

  • A
    $\frac{\pi}{4}$
  • B
    $\pi$
  • C
    $\frac{\pi}{2}$
  • D
    $2\pi$

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