$\int \frac{x^4-1}{x^2 \sqrt{x^4+x^2+1}} \, dx =$

  • A
    $\frac{\sqrt{x^4+x^2+1}}{x} + c$
  • B
    $\frac{2 \sqrt{x^4+x^2+1}}{x} + c$
  • C
    $\frac{\sqrt{x^4+x^2+1}}{2x} + c$
  • D
    $\frac{4 \sqrt{x^4+x^2+1}}{x} + c$

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