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

  • A
    $\sqrt{2 x^2+2+\frac{3}{x^2}}+c$
  • B
    $\sqrt{2 x^2-\frac{1}{x^2}+2}+c$
  • C
    $\sqrt{2 x^2+x-2}+c$
  • D
    $\frac{1}{2} \sqrt{2-\frac{2}{x^2}+\frac{1}{x^4}}+c$

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