Generate and plot the sequence in MATLAB n=-1:5 X=[1,2,1,20,-1,-2,2.5] stem(n, x, n=0:9 y=0.9.^n.*cos(0.2*pi*n+pi2) stem(n,y,)5 n=-1:5 x=[1,2,1.2,0,-1,-2,-2.5] stem(n,x, '.') n=0:9 y=0.9.^n.*cos(0.2*pi*n+pi/2) stem(n,y,'.') Generate and plot the sequence in MATLAB