4(cosx)^2 - 3 = 0 Add 3 to each side 4(cosx)^2 = 3 Divide both sides by 4 (cosx)^2 = 3/4 Take the square root of each side cosx = sqrt(3/4) or -sqrt(3/4) cosx = sqrt(3)/2 or -sqrt(3)/2 x = pi/6, 11pi/6 or 5pi/6, 7pi/6 x = 30, 330 or 150, 210
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