The value of \( \int \frac{\cos 7 x-\cos 8 x}{1+2 \cos 5 x} \cdot d x \) (a) \( \frac{\sin 2 x}{...

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The value of \( \int \frac{\cos 7 x-\cos 8 x}{1+2 \cos 5 x} \cdot d x \)
(a) \( \frac{\sin 2 x}{2}-\frac{\sin 4 x}{4}+C \)
(b) \( \frac{\sin 2 x}{2}-\frac{\sin 3 x}{3}+C \)
(c) \( \frac{\sin 2 x}{2}-\frac{\sin 5 x}{5}+C \)
(d) \( \frac{\sin 6 x}{6}-\frac{\sin 3 x}{3}+C \)
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