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Trigonometry Formulas Involving Product Identities.

sinA sinB=1/2[cos(A–B)−cos(A+B)]

cosAcosB=1/2[cos(A–B)+cos(A+B)]

sinAcosB=1/2[sin(A+B)+sin(A−B)]

cosAsinB=1/2[sin(A+B)–sin(A−B)]

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