समाकलन $\int_{-1}^{3} \left( \tan^{-1} \frac{x}{x^2+1} + \tan^{-1} \frac{x^2+1}{x} \right) dx = $

  • A
    $\pi$
  • B
    $2\pi$
  • C
    $3\pi$
  • D
    इनमें से कोई नहीं

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