先变形,由诱导公式cosα=sin(α+π/2)得y=cos(2x-π/6)+2=sin(2x-π/6+π/2)+2=sin(2x+π/3)+2即y=cos(2x-π/6）+2=sin(2x+π/3)+2横坐标伸长两倍得y=sin(x+π/3）+2然后向右平移π/3个单位得y=sinx+2最后向下移动2...