Express cos 9x sin 3x as a sum of two trigonometric functions.
University of Ilorin MTH101 salang past question
- (1/2)(sin 12x - sin 6x)
- (1/2)(cos 12x + cos 6x)
- (1/2)(sin 12x + sin 6x)
- (1/2)(cos 12x - cos 6x)
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