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+//Example 7.11a
+//Z transform of (a^n)cos(Wo*n)
+clc;
+syms Wo n z a;
+x1=(a^n)*exp(sqrt(-1)*Wo*n);
+X1=symsum(x1*(z^-n),n,0,%inf);
+x2=(a^n)*exp(-sqrt(-1)*Wo*n);
+X2=symsum(x2*(z^-n),n,0,%inf);
+X=(X1+X2)/2;
+disp(X,'X(z)=');
+\ No newline at end of file