y = cos²x+√3sinxcosx+1/2= 1/2 (cos2x+1) + √3/2 sin2x + 1/2= √3/2 sin2x + 1/2 cos2x + 1= sin2xcosπ/6 + cos2xsinπ/6 + 1= sin(2x+π/6) + 1最小正周期=2π/2=π2x+π/6∈（2kπ-π/2,2kπ+π/2）时单...