$\int_0^{\infty} \frac{dx}{(x^2+4)(x^2+9)}$ का मान ज्ञात कीजिए।

  • A
    $\frac{\pi}{60}$
  • B
    $\frac{\pi}{20}$
  • C
    $\frac{\pi}{40}$
  • D
    $\frac{\pi}{80}$

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