$\int_0^\pi \frac{x \, dx}{4 \cos^2 x + 9 \sin^2 x} = $

  • A
    $\frac{\pi^2}{12}$
  • B
    $\frac{\pi^2}{4}$
  • C
    $\frac{\pi^2}{6}$
  • D
    $\frac{\pi^2}{3}$

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