因为f(x)=sinx(cosx- √3sinx)=sinxcosx-√3(sinx)^2=1/2sin2x-√3/2(1-cos2x)=(1/2sin2x-√3/2cos2x)-√3/2=(sin2xcosπ/3-cos2xsinπ/3)-√3/2=sin(2x-π/3)-√3/2所以周期T=2π/2=π.