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## Homework Statement

http://img3.imageshack.us/img3/3939/opamp.jpg [Broken]

Draw an imaginary boundary around the op-amp, and apply KCL at the five wires that intersect the boundary

## Homework Equations

## The Attempt at a Solution

I am having quite a problem understanding the question above... which boundary should I draw around? Could someone point this out?

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