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posted by kc on Sunday, July 24, 2011 at 8:54pm.

solve the equation 4cos^2x-1=0

4c0s^2x - 1 = 0. 4cos^2x = 1, Divide both sids by 4: cos^2x = 0.25, Take sqrt of both sides: cosx = 0.5, X = 60 deg.

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