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Will award medal Find an exact value cos((19pi)/12)
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Look at your unit circle, did you notice how this value is not a part of what is labeled?
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Every time you go around the unit circle it is 2pi.
Your value is greater than 2pi. \[\frac{ 19\pi }{ 2 }~=~9\pi~and~\frac{ \pi }{ 2 }\](as a mixed fraction)
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