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OpenStudy (anonymous):
question about cosine and sine
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OpenStudy (anonymous):
Why is a.b.cos(thetaB-thetaA) equal to a.b{cos(thetaB).cos(thetaA) + sin(thetaB).sin(theta)} ??
OpenStudy (amistre64):
its has a geometric proof
OpenStudy (amistre64):
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