$\int x \operatorname{Tan}^{-1} \sqrt{\frac{1+x^2}{1-x^2}} \, dx =$

  • A
    $\frac{x^2}{4}\left(\pi-\operatorname{Cos}^{-1} x^2\right)+\frac{1}{4} \sqrt{1-x^2}+c$
  • B
    $\frac{x^2}{4}\left(\pi-\operatorname{Cos}^{-1} x^2\right)+\frac{1}{4} \sqrt{1-x^4}+c$
  • C
    $\frac{x^2}{4}\left(\pi+\operatorname{Cos}^{-1} x^2\right)-\frac{1}{4} \sqrt{1-x^4}+c$
  • D
    $\frac{x^2}{4}\left(\pi+\operatorname{Cos}^{-1} x^2\right)-\frac{1}{4} \sqrt{1-x^2}+c$

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