$\int \frac{x^2+1}{x^4+7 x^2+1} d x$ का मान ज्ञात कीजिए।

  • A
    $\frac{1}{3} \tan ^{-1}\left(\frac{x^2-1}{3 x}\right)+C$
  • B
    $\tan ^{-1}\left(\frac{x^2-1}{x}\right)+C$
  • C
    $\frac{1}{3} \tan ^{-1}\left(\frac{x^2-1}{x}\right)+C$
  • D
    $\frac{1}{\sqrt{3}} \tan ^{-1}\left(\frac{x^2-1}{\sqrt{3} x}\right)+C$

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