tJ 3: y=sin (t): y1=sin (t+0. 25) y 2=Sin (t+0. 5) y3=cos(t);y4=cos(t+0.25)y5=cos(t+0.5); plot(t,ly',y1,y2,y3,y4, y5D) 0.8 0.6 0.4 0.2 0.4 0.6 0.8例 3：y=sin(t);y1=sin(t+0.25);y2=sin(t+0.5); y3=cos(t);y4=cos(t+0.25);y5=cos(t+0.5); plot(t,[y',y1',y2',y3',y4',y5']) 0 1 2 3 4 5 6 7 -1 -0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.6 0.8 1