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sinx-siny= 2cos (x+y)/2 sin(x-y)/2 trigonometry identity solve
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sinx+siny=2sin(x+y/2)cos(x-y/2)
sinx+siny=2sin(x+y/2)cos(x-y/2)
Cosx-Cosy=-2sin(x+y)/2sin(x-y)/2 trigonometric identity
#Cosx-Cosy=-2sin(x+y)/2sin(x-y)/2 trigonometric
sinx+siny=2sin(x+y)/2 cos(x-y)/2
#cosx+cosy= 2cos (x+y)/2 cos(x-y)/2 #cosa+cosb=2cos(x+y)/2 cos(x-y)/2
#sinx-siny= 2cos (x+y)/2 sin(x-y)/2
thank you watch this video
sinx+siny=2sin(x+y/2)cos(x-y/2)
sinx+siny=2sin(x+y/2)cos(x-y/2)
Cosx-Cosy=-2sin(x+y)/2sin(x-y)/2 trigonometric identity
#Cosx-Cosy=-2sin(x+y)/2sin(x-y)/2 trigonometric
sinx+siny=2sin(x+y)/2 cos(x-y)/2
#cosx+cosy= 2cos (x+y)/2 cos(x-y)/2 #cosa+cosb=2cos(x+y)/2 cos(x-y)/2
#sinx-siny= 2cos (x+y)/2 sin(x-y)/2
thank you watch this video
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