यदि $\int \frac{x^2+1}{x^4+1} dx = f(x) + c$ है,तो $f(x)$ किसके बराबर है?

  • A
    $\frac{1}{\sqrt{2}} \tan^{-1}\left(\frac{x^2+1}{\sqrt{2}x}\right)$
  • B
    $\frac{1}{\sqrt{2}} \tan^{-1}\left(\frac{x^2-1}{\sqrt{2}x}\right)$
  • C
    $\frac{1}{\sqrt{2}} \tan^{-1}\left(\frac{1-x^2}{\sqrt{2}x}\right)$
  • D
    $\frac{1}{\sqrt{2}} \tan^{-1}\left(\frac{1+x^4}{\sqrt{2}x}\right)$

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