Adding Sine Functions

• sinAcosB = 1/2[sin(A+B) + sin(AñB)]

• Or, making A = (P+Q)/2 and B = (PñQ)/2

• That is: A+B = 2P/2 and AñB = 2Q/2

• 1/2[sin P + sin Q] = sin (P+Q)/2 cos (PñQ)/2

• sin P + sin Q = 2 sin (P+Q)/2 cos (PñQ)/2

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