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+//Example 1.49b
+//Determine whether the signal x(n)=cos(pi*n/2)cos(pi*n/4)
+clc;
+n=0:1/100:100
+x0=cos((%pi*n/2)+(%pi*n/4))
+x1=cos((%pi*n/2)-(%pi*n/4))
+x=(x0+x1)/2;
+plot(x);
+disp('plot shows that this is a periodic signal');
+\ No newline at end of file