Using the product-to-sum formula, 2sinAcosB=2\sin A\cos B =2sinAcosB=:
sin(A+B)+sin(A−B)\sin(A+B) + \sin(A-B)sin(A+B)+sin(A−B)
cos(A−B)−cos(A+B)\cos(A-B) - \cos(A+B)cos(A−B)−cos(A+B)
sin(A+B)−sin(A−B)\sin(A+B) - \sin(A-B)sin(A+B)−sin(A−B)
cos(A+B)+cos(A−B)\cos(A+B) + \cos(A-B)cos(A+B)+cos(A−B)