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OpenStudy (anonymous):
cos^-1 (-1/2)
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OpenStudy (bradely):
y = cos^-1 (-1/2) cosy=(-1/2) cosy=cos 2pi/3 y=2pi/3 cos^-1 (-1/2)=2pi/3 source: http://www.mathskey.com/question2answer/ask
OpenStudy (anonymous):
thank you so much! i read that there were different answers and didn't understand how people got it.
OpenStudy (bradely):
where u read ?
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