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The double angle sin 2x is equal to which expression?
A2 sin x cos x
Bsin²x - cos²x
C2 sin x + 2 cos x
Dsin x cos x
Answer & Solution
Correct answer: A. 2 sin x cos x
The sum formula for sin(x + x) gives sin x cos x + cos x sin x, which is 2 sin x cos x.
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