Trigonometry Formulas Involving Product Identities.
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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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Math Formula
- asked 3 years ago
- B Butts