$\int \frac{x^2-1}{x^3 \sqrt{2 x^4-2 x^2+1}} d x=$

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

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