Express \( \cos 4x - \cos 2x \) as a product of two trigonometric ratios.
University of Ilorin MTH101 salang past question
- \(-2 \sin 3x \sin x\)
- \(2 \sin 3x \sin x\)
- \(-2 \cos 3x \cos x\)
- \(2 \cos 3x \cos x\)
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