$\int \frac{x^2}{(x^2-1)(x^2+1)} dx = $

  • A
    $\frac{1}{4} \log \left|\frac{x+1}{x-1}\right| - \frac{1}{2} \tan^{-1} x + c$
  • B
    $\frac{1}{4} \log \left|\frac{x-1}{x+1}\right| + \frac{1}{2} \tan^{-1} x + c$
  • C
    $\frac{1}{4} \log \left|\frac{x-1}{x+1}\right| - \frac{1}{2} \tan^{-1} x + c$
  • D
    $\frac{1}{4} \log \left|\frac{x+1}{x-1}\right| + \frac{1}{2} \tan^{-1} x + c$

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