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OpenStudy (anonymous):
Please help!! Multiple choice... complete the identity. sin x (sin 4x + sin 6x) a. 1/2 cos x (cos 4x + cos 6x) b. 1/2 cos x (cos 4 x - cos 6x) c. cos x (cos 4 x - cos 6x) d. cos x (cos 4 x + cos 6x)
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