x=0.05:0.05:6*pi;
y=0.25*x;
z=sin(y)./y;
w=z.^2;
t=0.5-0.5*cos(x);
q=w.*t;
figure(1); plot(x,q);grid;
figure(2); plot(w); grid;
figure(3); plot(t); grid;
whitebg;