જો $\int {\frac{{({x^2} - 1)\,dx}}{{({x^4} + 3{x^2} + 1)\,{{\tan }^{ - 1}}\left( {\frac{{{x^2} + 1}}{x}} \right)}}} = \ln | f(x) | + C$ હોય,તો $f(x)$ શું છે?

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

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