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## Homework Statement

Show that the equivalent resistance is Req = 1/2 [(4RtRl + Rt^2)^(.5) + Rt]

http://img74.imageshack.us/img74/5905/pingib2.png [Broken]

## Homework Equations

## The Attempt at a Solution

So far all I can get is Req = Rt + Rl Rt/(Rt+Rl) from the first three resistors starting from the left. I suppose I could take that and add it to the next branch Rl Rt/(Rt+Rl), but that would appear to go on to infinity as opposed to stopping at a nice number.

Does anyone have any hints on finding the eq. resistance?

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