求解数学题:若x∈[π/6,2π/3],则函数y=2cos(x-π/3)的最小值与最大值分别为?
求高人,表示我做到-π/6≤x-π/3≤π/3.求解怎么做下去,谢谢.求完整过程,求详细概念解说,谢谢!