4cos^{2}x +2sinx cosx =1
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Solve the equation (sqrt(3)),2sinx-cosx=cos^2x . ... 3sin2x=4(cos2x+cosx)2 3(1-cos2x)=4(cos4 x+2cos3x+cos2x) 4cos4x+8cos3x+7cos2x-3= ...
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