Posted by Courtney on Wednesday, May 12, 2010 at 12:12pm.
4 cos^2x-1=0
cos^2 x = 1/4
cosx = ± 1/2
In I x = 60
in II , x = 180-60 = 120
in III, x = 180+60 = 240
in IV , x = 360-60 = 300
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