$\int \frac{x-1}{(x+1) \sqrt{x^3+x^2+x}} d x=$

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

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