∵f(x)=2cos(cosx+√3sinx)-1
=2cos2[(1/2)cosx+(√3/2)sinx]-1
=2cos2[cosxcos(π/3)+sinxsin(π/3)]-1
=2cos2[cos(x-π/3)]-1
∴函数f(x)的最小正周期为：T=2π/1
=2π