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

  • A
    $\frac{\pi}{4}+\frac{2}{3} \tan ^{-1} 2$
  • B
    $-\frac{\pi}{3}-\frac{2}{3} \tan ^{-1} 3$
  • C
    $-\frac{\pi}{12}+\frac{2}{3} \tan ^{-1} 2$
  • D
    $\frac{\pi}{6}-\frac{2}{3} \tan ^{-1} 4$

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