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Posted by Tabitha on Thursday, January 20, 2011 at 3:34pm.
Solve:cos^2x=1 for 0 < x is less than or equal to 2pi
cos^2 x = 1 take square root of both sides +- cos x = 1 cos x = 1 cos x = -1 for what angle value is cos = 1 and cos = -1 ?
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