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Thevenin with variables

1. Homework Statement
For the circuit shown: Find the Thev Eq between nodes A and B and then for nodes C and D.
I worked the second half of the equation but am stuck on how to begin the analysis for the opposite end of the circuit. I have attatched the image as well as posting it as I am having some issues with this terminal.

2. Homework Equations
Voc=Isc*Rth
KVL
KCL


3. The Attempt at a Solution http://http://i625.photobucket.com/albums/tt333/sisyphus0321/untitled.jpg?t=1238023439 [Broken]
Between C and D:
ix+Bix=Voc/Ro
Voc=Ro[ix+Bix]
Isc= ix + Bix
Rth=Ro
 

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Can you make the image bigger? It's too small to be readable and gets too blurry if zoomed.
 
Sorry.
 

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I believe http://www.scribd.com/doc/454419/Class-3-Thevenins-and-Nortons-Theorem [Broken] is of use in this problem. If you still have problems, I'll try to clarify things.

And the picture is readable now, thank you.
 
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