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Which is the correct formula for sin 3θ?
A4 sin³θ − 3 sin θ
B3 sin θ − 4 sin³θ
C3 sin θ + 4 sin³θ
D4 sin θ − 3 sin³θ
Answer & Solution
Correct answer: B. 3 sin θ − 4 sin³θ
Expanding sin(2θ + θ) and using the double-angle rules gives sin 3θ = 3 sin θ − 4 sin³θ.
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