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## Homework Statement

The picture is an closed loop amplifier, the question is simple: find the closed-loop voltage amplifier of the circuit

## Homework Equations

Av = v0/v in = - (R2/R1)

## The Attempt at a Solution

If R2 is just simply a bunch of resistors connecting crazily, then it is no problem to me, but in here, R2 is partly connected to the ground (2 connected to the ground), so if anyone could explain how the part connecting to the ground affecting the closed loop formula, i would very thankful.