f(x)=1+2(√3)sinxcosx+2(cosx)^2f(x)=2(√3)sinxcosx-[1-2(cosx)^2]+2f(x)=(√3)sin2x-cos2x+2f(x)=2{[(√3)/2]sin2x-(1/2)cos2x}+2f(x)=2[sin(π/3)sin2x-cos(π/3)cos2x]+2f(x)=2cos(2x+π/3)+21、最小正周期：2...