$\int_{0}^{\pi} \frac{x \, dx}{a^2 \cos^2 x + b^2 \sin^2 x} = $

  • A
    $\frac{\pi}{ab}$
  • B
    $\frac{\pi}{2ab}$
  • C
    $\frac{\pi^2}{ab}$
  • D
    $\frac{\pi^2}{2ab}$

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