函数f(x)=cos(2x-π/3)+sin^2 x-cos^2 x
=cos2xcos(π/3)+sin2xsin(π/3)-cos2x
=√3/2 sin2x-1/2 cos2x
=sin(2x-π/6)
函数f(x)的最小正周期 T=π
g(x)的值域?