Use the double angle identity: sin(u±v) - sinu cosv ± cosu sinv
sin(x+y)-sin(x-y)
= sinx cosy + cosx siny - [sinx cosy - cosx siny]
= 2 cosx siny
David C.
asked • 03/25/15The exression
sin(x+y) - sin(x-y) is equal to...
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