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What is sin alpha - sin beta =

This question belongs to Arithmetic Ability Trigonometry
Trigonometry
?

What is $$\sin \alpha - \sin \beta = ?$$

Answer & Solution
Correct Answer: Option A
$$\sin \alpha - \sin \beta = 2\cos \frac{{\alpha + \beta }}{2}.\sin \frac{{\alpha - \beta }}{2}$$
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