y=sin(2x+3分之派) =cos(π/2-2x-π/3) =cos(-2x+π/6) =cos(2x-π/6) =cos[2(x-π/12)所以可由y=cos2x的图像向右平移π/12个单位得到
先将y=cos2x沿着X轴左移π/4，得到sin2X,再将函数左移π/6，便可得到y=sin(2x+π/3)
向右平移3分之派sin(2x+π/3)=cos(2/3π-2x)=cos[2(x-π/3)]
