$\int \frac{e^{\tan ^{-1} x}}{1+x^2}\left[\left(\sec ^{-1} \sqrt{1+x^2}\right)^2+\cos ^{-1}\left(\frac{1-x^2}{1+x^2}\right)\right] d x=$

  • A
    $e^{\tan ^{-1} x}(\tan ^{-1} x)^2+C$
  • B
    $e^{\tan ^{-1} x}(\sec ^{-1} x)^2+C$
  • C
    $e^{\tan ^{-1} x}(\sec ^{-1} \sqrt{1+x^2})+C$
  • D
    $e^{\tan ^{-1} x}(\cos ^{-1}(\frac{1-x^2}{1+x^2}))+C$

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