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

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

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