$\int \frac{\cos 7x - \cos 8x}{1 + 2 \cos 5x} dx = $

  • A
    $\sin 2x - \frac{1}{3} \sin 3x + c$
  • B
    $\frac{1}{2} \sin 2x - \frac{1}{3} \sin 3x + c$
  • C
    $\frac{1}{2} \sin 2x - \sin 3x + c$
  • D
    $\frac{1}{3} \sin 2x - \frac{1}{2} \sin 3x + c$

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