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Recursion Limit & Symbolic Differentiation


Hi,

I'm new to Mathemtica and I'm trying to differentiate a multi-variable
function 
f(x,y,z). When doing so I get a recusion limit 256 reached message. 

When examining my equations, I don't see recursion in the expressions.
It should be simple substitution of one expression into the other.
(Its just easier for me to write it that way). 

How do I know if this is a valid message, and how do I know if my
expressions will actually be solved / simplified by Mathematica if I
increase the recursion limit?

I have 2GB RAM and Mathematica fills it, then the Kernel runs out of
memory and stops trying to solve the problem. 

Thanks.


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