$\int \frac{\sin 7x}{\sin 2x \sin 5x} dx =$

  • A
    $\log (\sin 5x \sin 2x) + c$
  • B
    $\log \sin 5x + \sin 2x + c$
  • C
    $\frac{1}{5} \log \sin 5x + \frac{1}{2} \log \sin 2x + c$
  • D
    $\frac{1}{5} \log \sin x + \frac{1}{2} \log \sin x + c$

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