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syms Ro Ra Rb Rc Rd
//shifting summing points to left of 1/Ra and 1/Rb and combining the summing points
a=((1/Ra)*Rc)/(1+(1/Ra)*Rc*1)
b=(Rd/Rb)/(1+(Rd/Rb))
//shift input summing points to the right and combine the three summing points
c=(1/Ro)/(1+(1/Ro)*(Ra*Rc/(Ra+Rc)))
d=c/(1-(b*Rb*c))
e=a-b
Y=e*d
disp(Y,"Io/Vi = ")
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