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OpenStudy (anonymous):
Use an appropriate Half-Angle Formula to find the exact value of the expression. cos 112.5°
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OpenStudy (anonymous):
cos112.5=[(1+cos225)/2]^0.5
OpenStudy (anonymous):
and it could be positive or negative
OpenStudy (anonymous):
or you may simplify first, cos112.5=-sin22.5
OpenStudy (anonymous):
-sin22.5=-[(1-cos45)/2]^0.5
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