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+//Ex 5.6
+clc;
+clear;
+close;
+format('v',8);
+R3=1;//kohm
+Rt=5;//kohm
+Ri=1.8;R1=1.8;//kohm
+Rf=18;R2=18;//kohm
+Vs=15;//V
+AoL=2*10^5;//Gain(for 741C)
+Rio=2//Mohm
+Ro=75//Mohm
+fo=5;//Hz
+fBW=1;//MHz
+Ad=Rf/Ri*(1+2*R3/Rt);//differential gain
+disp(Ad,"Differential gain");
+Beta=(R3+Rt)/(2*R3+Rt);//unitless
+Rix=Rio*10^6*(1+AoL*Beta);//ohm
+disp(Rix,"Input impedence, Rix(ohm)");
+Rof=Ro/(1+AoL/Ad);//ohm
+disp(Rof,"Output impedence, Rof(ohm)");
+//Answer in the book is wron for Rix.