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+//example 5.2 (c)
+//Z-transform of sine signal
+syms n z;
+Wo =%pi/4;
+a = (0.33)^n;
+x1=%e^(sqrt(-1)*Wo*n);
+X1=symsum(a*x1*(z^(-n)),n,0,%inf)
+x2=%e^(-sqrt(-1)*Wo*n)
+X2=symsum(a*x2*(z^(-n)),n,0,%inf)
+X =(1/(2*sqrt(-1)))*(X1+X2)
+disp(X,"ans=")
+
+//example 5.2 (a)
+//Z-transform of Impulse Sequence
+syms n z;
+X=symsum(1*(z^(-n)),n,0,0);
+disp(X,"ans=")
+
+//example 5.2 (d)
+//Z-transform of given Sequence
+syms n z;
+X=symsum(1*(z^(-n)),n,0,4);
+disp(X,"ans=")
+
+//example 5.2 (b)
+//Z-transform of unit function Sequence
+syms n z;
+X=symsum(1*(z^(-n)),n,0,%inf);
+disp(X,"ans=")
+\ No newline at end of file