$\int \frac{1}{\cos x} \left[ \frac{1}{\sin x} - \frac{1}{\sin x + 3 \cos x} \right] dx =$

  • A
    $\frac{1}{3} \log \left| \frac{\sin x}{\sin x + 3 \cos x} \right| + c$
  • B
    $\log \left| \frac{\cos x}{\sin x + 3 \cos x} \right| + c$
  • C
    $\frac{1}{3} \log \left| \frac{\cos x}{\sin x + 3 \cos x} \right| + c$
  • D
    $\log \left| \frac{\sin x}{\sin x + 3 \cos x} \right| + c$

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