sinα*cosβ=(1/2)[sin(α+β)+sin(α-β)]
cosα*sinβ=(1/2)[sin(α+β)-sin(α-β)]
cosα*cosβ=(1/2)[cos(α+β)+cos(α-β)]
sinα*sinβ=(1/2)[cos(α-β)-cos(α+β)]
sinα*cosβ=(1/2)[sin(α+β)+sin(α-β)]
cosα*sinβ=(1/2)[sin(α+β)-sin(α-β)]
cosα*cosβ=(1/2)[cos(α+β)+cos(α-β)]
sinα*sinβ=(1/2)[cos(α-β)-cos(α+β)]