为得到函数Y=COS（2X+∏/3）的图象,只需将函数Y=sin2X的图象怎么平移得到?

y=cos(2x+π/3)
=cos(-2x-π/3)
=sin[π/2-(-2x-π/3)]
=sin(2x+5π/6)
=sin[2(x+5π/12)]
所以向左移5π/12