ï»¿ Factor Formula - the sum of sine of two angles

# Factor Formula - the sum of sine of two angles

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The sum of sine of two angles is equal to the double of the product of sine of average of the two angles and cosine of half of the difference of the two angles.

\sin \alpha + \sin \beta = 2\sin\dfrac{\alpha +\beta }{2} \cos\dfrac{\alpha -\beta }{2}

or

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