Discussion
The value of \(2\sin 15° \cos 15°\) is:
Answer: B
This is the double-angle formula in reverse.
\[ 2\sin A\cos A = \sin 2A \]
\[ 2\sin 15^{\circ}\cos 15^{\circ} = \sin 30^{\circ} = \frac{1}{2} \]
Recognising the form avoids having to evaluate either 15° value.
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