f（x）=2√3sinxcosx+2cos²x-1（x∈R） f(x) = 2√3sinxcosx+2cos²x-1= √3 * ( 2sinxcosx) + (2cos²x-1)= 根号3 sin2x + cos2x= 2 (sin2xcosπ/6+cos2xsinπ/6)=2 sin(2x+π/6)最小正周期：2π/2 = ...