Express $\sin (a + b) - \sin (a - b)$ as the product of trigonometric functions.
Question:
Express $\sin (a + b) - \sin (a - b)$ as the product of trigonometric functions.
Answer:
Let's think step by step.

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2 \sin b \cos a
Express $\sin (a + b) - \sin (a - b)$ as the product of trigonometric functions.
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