Breaking long output lines in the notebook?    
   Is there any way of using the LaTeX breqn package to automatically break up a long expression?  I have an expression which I can scroll through, but it would be nice to see it all at once.  This should seem trivial, but if I ever knew how to do this, I've forgotten.  I'm using Sage 7.2.
 
 
Could you provide an example of such a long expression and describe what you would hope to do achieve?