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

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

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