y=cos2x=sin(2x+π/2)=sin(2x-π/6+2π/3)=sin2(x-π/12+π/3)即cos2(x-π/3)=sin(2x-π/6)所以y=sin(2x-π/6)可以将函数y=cos2x的图像向右移π/3得到所以选B【此时应该是左加右减,这个很容易搞混,将y=cos2x的图像向...