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+clc;
+re=22.3; //Ohm
+Hfe=200;
+Zbase=Hfe*re; //Ohm
+R1=18000; //Ohm
+R2=4700; //Ohm
+Req=(R1*R2)/(R1+R2); //Ohm
+Zin=(Req*Zbase)/(Req+Zbase); //Ohm
+disp('kohm',Zin/1000,"Zin=");//The answers vary due to round off error
+
+