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sin(A+B) = (sinAcosB + cosAsinB)
sin(A-B) = (sinAcosB - cosAsinB)
2cosPsinQ = (sinPcosQ + cosPsinQ) -
( sinPcosQ -cosPsinQ )
2cosPsinQ = sinPcosQ + cosPsinQ - sinPcosQ+
cosPsinQ
2cosPsinQ = cosPsinQ + cosPsinQ
2cosPsinQ = 2cosPsinQ
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