$\int_0^{\frac{\pi}{2}} \frac{d x}{\cos x-\sqrt{3} \sin x}=$

  • A
    $0$
  • B
    $\frac{1}{2} \log (2-\sqrt{3})$
  • C
    $\frac{1}{2} \log (2+\sqrt{3})$
  • D
    $\frac{1}{2} \log (2 \sqrt{3}-3)$

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