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

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

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