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

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

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