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OpenStudy (anonymous):
Find all the solutions to the equation: cos^2x+cosx=cos2x in the interval [0,2pi)
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OpenStudy (anonymous):
cos^2x+cosx=cos2x cos^2x + cosx =2cos^2(x) - 1 cos^2x - cosx - 1=0 cosx= 1+- sqrt( 1+4) /2
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