% Lab 1
% Question 4 

fs=4;
ts=1/fs;

n=0:1:99;
x(n+1)=cos(2*pi*n*ts/5)+sin(4*pi*n*ts/7)+cos(16*pi*n*ts/9);

stem(n,x,'linewidth',2);
xlabel('n')
ylabel('x(n)')