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+//example:-5.3,page no.-220.
+// program to find the z parameter of the two port network.
+syms Z11 Z12 Z22 Z21 V1 I1 V2 I2 Za Zb Zc;
+Z11=Za+Zc;  // for I2=0.
+Z12=(Zc/(Zb+Zc))*(Zb+Zc);  //for I1=0.
+Z21=(Zc/(Za+Zc))*(Za+Zc);  // for I2=0.
+Z22=Zb+Zc;   //for I1=0.
+Z=[Z11 Z12;Z21 Z22];  // z-parameter matrix.
+disp(Z,'Z-parameter of two port network = ')
+\ No newline at end of file