y=2(sin2x*1/2-cos2x*√3/2)
=2(sin2xcosπ/3-cos2xsinπ/3)
=2sin(2x-π/3)
向左平移∏/3个单位长度
是y=2sin[2(x+π/3)-π/3]
=2sin(2x+π/3)