x为{0,π/2),则(2x-π/3)范围是{-π/3,2π/3},sin(2x-π/3)即为{-√3/2,1}
(1)a>0,则2a+b=1,-√3a+b=-5,a=6/(2+√3)=12-6√3,b=12√3-23
(2)a