f(x)=2sinx/4cosx/4-2√3sin²x/4+√3=sinx/2+√3(1-2sin²x/4)=sinx/2+√3cosx/2=2(1/2sinx/2+√3/2cosx/2)=2(cosπ/3sinx/2+sinπ/3cosx/2)=2sin(x/2+π/3)T=2π/w=4π最大值2,最小值-2