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Write sin 5θ + sin 3θ as a product.
A2 cos 4θ sin θ
B2 sin 8θ cos 2θ
C2 sin 4θ cos θ
D2 cos 4θ cos θ
Answer & Solution
Correct answer: C. 2 sin 4θ cos θ
The mean angle is 4θ and half the difference is θ, so sin 5θ + sin 3θ = 2 sin 4θ cos θ.
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