y3=cos(t);y4=cos(+0.25);y5=cs(+0.5); plot(t, y3); hold on; plot(t, y4); plot(t, y5 0.8 0.6 -0.8 6y3=cos(t);y4=cos(t+0.25);y5=cos(t+0.5); plot(t,y3);hold on; plot(t,y4); plot(t,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