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Which expression equals 3 sin θ - 4 sin³θ for every θ?
Asin 3θ
Bcos 3θ
C3 sin 2θ
Dsin θ cos θ
Answer & Solution
Correct answer: A. sin 3θ
This is the triple-angle formula for sine, sin 3θ = 3 sin θ - 4 sin³θ.
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