Posted by VesaN on Friday, May 7, 2010 at 12:35pm.
square both sides
cos^2 -2sin*cos + sin^2<1/4
1-sin(2x)<1/4
sin(2x)<-3/4
2x>131deg
x>65.5 deg
2x<311
x<155 check that with a graph.
thnx
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