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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 (turingtest):
\[\cos (112.5°)=\cos ({225°\over2})\]\[\cos^2({\theta \over2})={1\over2}(1+\cos \theta)\]between these two formulas lies your answer...
OpenStudy (anonymous):
I don't get it!
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