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

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The value of \( \int \frac{\cos 7 x-\cos 8 x}{1+2 \cos 5 x} d x \)
\( \mathrm{P}^{12: 4} \)
W
(1) \( \frac{\sin 2 x}{2}+\frac{\cos 3 x}{3}+C \)
(2) \( \sin x-\cos +\mathrm{C} \)
(3) \( \frac{\sin 2 x}{2}-\frac{\cos 3 x}{3}+C \)
(4) None of these
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