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OpenStudy (pbonnette):
Which expression completes the identity cos ucos v = ?
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OpenStudy (pbonnette):
I got \[\frac{ 1 }{ 2 } [\cos (A-B) + \cos(A+B)\]
OpenStudy (3mar):
Did you tag me here?
OpenStudy (3mar):
The one before the last one!
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