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Mathematics 10 Online
OpenStudy (anonymous):

If 0º

OpenStudy (lasttccasey):

According to the trig circle: http://wiki.ubc.ca/images/2/29/UnitCircle2.gif When \[\sin x = \frac{ 1 }{ 2 }\]then,\[\cos x = \frac{ \sqrt{3} }{ 2 }\]

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