$\int_0^{\pi / 4} \frac{\cos ^2 x}{\cos ^2 x+4 \sin ^2 x} d x=$

  • A
    $\frac{\pi}{6} - \frac{1}{3} \tan^{-1} 2$
  • B
    $\frac{\pi}{12} - \frac{1}{3} \tan^{-1} 2$
  • C
    $\frac{\pi}{6} + \frac{2}{3} \tan^{-1} 2$
  • D
    $\frac{\pi}{12} + \frac{1}{3} \tan^{-1} 2$

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