这里需要公式：cos(π-x)=sinx,sin(π/2-x)=cosx
y=[sin2x+sin(2x+π/3)-cos(π/2-2x﹚]/[cos2x+cos﹙2x+π/3﹚-sin(π/2-2x)]
=[sin2x+sin(2x+π/3)-sin2x]/[cos2x+cos﹙2x+π/3﹚-cos2x]
=sin(2x+π/3)/cos﹙2x+π/3﹚
=tan(2x+π/3)
即y=tan(2x-π/3)
所以最小正周期为：π/2.