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OpenStudy (anonymous):
Simplify: (1 / 2)[cos(u + v) + cos(u – v)]
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OpenStudy (anonymous):
i do believe that those are addition formulas
OpenStudy (anonymous):
where cos(u+v) = cos u cos v - sin u sin v
OpenStudy (anonymous):
and cos(u - v) = cos u cos v + sin u sin v
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