ધારો કે $I = \int \tan^{-1} \left( \frac{2x}{1-x^2} \right) dx$,તો $I - 2x \tan^{-1} x = $

  • A
    $\log(1+x^2) + c$
  • B
    $-\log(1+x^2) + c$
  • C
    $-\log(1-x^2) + c$
  • D
    $\log \left| \frac{2x}{1-x^2} \right| + c$

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