$\int_{0}^{\infty} \frac{dx}{(x^{2}+4)(x^{2}+9)} = $

  • A
    $\frac{\pi}{120}$
  • B
    $\frac{\pi}{60}$
  • C
    $\frac{\pi}{80}$
  • D
    $\frac{-\pi}{60}$

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