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+//Example 4.10
+//Find DTFT of x[n]=cos(Won) with Wo=(2*pi/5)
+clc;
+syms w n;
+x1=exp(%i*(2*%pi*n/5));
+x2=exp(-%i*(2*%pi*n/5));
+X1=symsum(x1*exp(-%i*w*n),n,0,%inf);
+X2=symsum(x2*exp(-%i*w*n),n,0,%inf);
+X=(X1+X2)/2;
+\ No newline at end of file