$\int_0^\infty {\frac{{{x^2}\,dx}}{{({x^2} + {a^2})({x^2} + {b^2})}}} = $

  • A
    $\frac{\pi }{{2(a - b)}}$
  • B
    $\frac{\pi }{{2(b - a)}}$
  • C
    $\frac{\pi }{{(a + b)}}$
  • D
    $\frac{\pi }{{2(a + b)}}$

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$\int_{0}^{3} \frac{3x + 1}{x^2 + 9} dx = $

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