Express as a product:
(a) sin 8u + sin 2u(b) cos 3θ −cos 8θ(c) (d) 3 cos 2x + 3 cos 6x
(a) sin 8u + sin 2u
(b) cos 3θ −cos 8θ
(c)
(d) 3 cos 2x + 3 cos 6x
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