data com 3

clc;

clear all;

Ac=1;
fm=5;
fc=50;
t=linspace(0,1,500);
df=fm-fc;

ym=cos(2*pi*fm*t);
subplot(3,1,1);
plot(t,ym);


yc=cos(2*pi*fc*t);
subplot(3,1,2);
plot(t,yc);

s=Ac*cos((2*pi*fc*t)+(df/fm)*sin(2*pi*fm*t));
subplot(3,1,3);
plot(t,s);