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January 31, 2015

January 31, 2015

Posted by **Kate** on Monday, April 16, 2007 at 7:38pm.

cos^2x=3-5cosx

rewrite it as..

cos^2x + 5cosx -3=0

now you have a quadratic, solve for cos x using the equation

cosx=(-5 -+ sqrt (25 +12)/2

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