=(（sin^2 (x/2) +(cos^2 (x/2))^2-2×sin^2(x/2)cos^2(x/2)+ √3/4sin2x=1-1/2(2sin(x/2)con(x/2))^2+√3/4sin2x=1-1/2sin^2(x)+ √3/4sin2x=1-1/2(1/2×(1-cos2x))+√3/4sin2x=1-1/4+1/4cos2x+√3/4sin2x=3/4+1/2(...