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+//scilab 5.4.1

+//Windows 7 operating system

+//chapter 14 Integrated Circuits and Operational Amplifiers

+clc

+clear

+R1=10*1000//R1=resistance in ohms

+R2=100//R2=resistance in ohms

+R3=10*1000//R3=resistance in ohms

+R4=10*1000//R4=resistance in ohms

+R5=10*1000//R5=resistance in ohms

+//Since the voltage gains of the OP AMPs are infinite,the voltages of the points X and Y in the given figure are V1 and V2 respectively

+//Applying Kirchhoff's current law at X

+//(V1/R1)+((V1-V)/R3)+((V1-V2)/R2)=0

+//Applying Kirchhoff's current law at Y

+//((V2-V)/R4)+((V2-V1)/R2)+((V2-Vo)/R5)=0

+//Eliminating V from the above equations

+//V2*((1/R2)+(1/R4)+(1/R5)+(R3/(R2*R4)))-V1*((1/R2)+(1/R4)+((R3/R4)*((1/R1)+(1/R2))))=Vo/R5

+//V2*R-V1*r=Vo/R5...................(1)

+R=((1/R2)+(1/R4)+(1/R5)+(R3/(R2*R4)))

+r=((1/R2)+(1/R4)+((R3/R4)*((1/R1)+(1/R2))))

+disp(R,"R=")

+disp(r,"r=")

+//R=r from above calculation and its answer displayed

+//Hence from the above equation (1) A=Vo/(V1-V2)=-(R5*R)=-(R5*r)

+disp(-R5*r,"Differential mode gain A=Vo/(V1-V2)=")