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express the given sum or difference as a product of sine/cosines

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Oct 16th, 2017

sin A − sin B  =  2 sin ½ (AB) cos ½ (A + B)

sin 5Ө - sin 3Ө = 2 sin ½ ( 5Ө − 3Ө) cos ½ ( 5Ө + 3Ө) = 2 sin Ө cos 4Ө

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Mar 3rd, 2015

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