$\int_1^2 \left( \tan ^{-1}\left(\frac{x}{x^2+1}\right)+\tan ^{-1}\left(\frac{x^2+1}{x}\right) \right) d x =$

  • A
    $\frac{\pi}{4}$
  • B
    $\frac{3 \pi}{4}$
  • C
    $\frac{\pi}{4}$
  • D
    $\frac{\pi}{2}$

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