In the circuit shown below, let






R1=1000;R2=6000;Ri=4000;Ro=500;vs=1;A=2000;

syms vn vo

[vn,vo]=solve((vn-vs)/R1+vn/Ri+(vn-vo)/R2,...

(vo-vn)/R2+(vo-A*(0-vn))/Ro,vn,vo);

is=(vs-vn)/R1;

Rin=vs/is;

vn=vpa(vn,11)

vo=vpa(vo,11)

is=vpa(is,11)

Rin=vpa(Rin,11)

Answers:

vn =

0.0032352392211

vo =

-5.9725004666

is =

0.00099676476078

Rin =

1003.24574

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