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+// Example 7.4
+format('v',6)
+clc;
+clear;
+close;
+// given data
+R_E= 430;// in Ω
+R_L= 100;// in Ω
+R1= 10*10^3;// in Ω
+R2= 10*10^3;// in Ω
+bita= 200;
+r_e= 2.5;// in Ω
+// The load resistance
+r_L= R_E*R_L/(R_E+R_L);// in Ω
+// The power gain 
+G= bita*r_L/(r_L+r_e);
+disp(G,"The power gain is : ")