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

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

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