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OpenStudy (anonymous):
cos(a+B) - cos(a-B).... i'm getting 0.... i feel like it's wrong
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geerky42 (geerky42):
Remember, \(\cos(\alpha \pm \beta) = \cos\alpha\cos\beta \mp \sin\alpha\sin\beta\)
OpenStudy (anonymous):
=cosa*cosb - sena*senb - (cosa*cosb + sena*senb) = -2*sena*senb
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