Express as a sum or difference:
(a) sin 7t sin 4t(b) (c) 6 cos 5x sin 3x(d) 4 sin 3θ cos 7θ
(a) sin 7t sin 4t
(b)
(c) 6 cos 5x sin 3x
(d) 4 sin 3θ cos 7θ
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