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sin(2θ) equals:

A2 sin θ cos θ
Bsin²θ - cos²θ
Csin θ + cos θ
D2 sin θ
Answer & Solution
Correct answer: A. 2 sin θ cos θ
**Double-angle formula:** sin(2θ) = 2 sinθ cosθ. (Derived from sin(θ + θ).)
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