$\int \operatorname{Cos}^{-1}\left(\frac{1-x^2}{1+x^2}\right) d x=$

  • A
    $2\left[x \operatorname{Tan}^{-1} x-\log \sqrt{1+x^2}\right]+c$
  • B
    $2x \operatorname{Tan}^{-1} x+\log \sqrt{1-x^2}+c$
  • C
    $x \operatorname{Tan}^{-1} x+\log \sqrt{1-x^2}+c$
  • D
    $2\left[\operatorname{Tan}^{-1} x-\log \sqrt{1+x^2}\right]+c$

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