\cos x \cos \frac{x}{2}-\cos 3 x \cos \frac{9 x}{2}=\sin 7 x \sin 8 x – InterviewSolution

1.	\cos x \cos \frac{x}{2}-\cos 3 x \cos \frac{9 x}{2}=\sin 7 x \sin 8 x
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