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Mathematics 17 Online
OpenStudy (anonymous):

Find all c in the interval [pi,2pi] such that 2cosx=1.

OpenStudy (jdoe0001):

\(\bf 2cos(x)=1\implies cos(x)=\cfrac{1}{2}\qquad \textit{then take }cos^{-1}\textit{ to both sides}\)

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