$\int_0^{\pi / 2} \frac{\cos x}{3 \cos x+\sin x} d x=$

  • A
    $\frac{3 \pi}{20}-\frac{\log 3}{100}$
  • B
    $\frac{3 \pi}{10}-\frac{\log 3}{10}$
  • C
    $\frac{3 \pi}{20}+\frac{\log 3}{10}$
  • D
    $\frac{3 \pi}{20}-\frac{\log 3}{10}$

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