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Hehe.. Funny you should mention tex/latex, Im doing my math homework in LyX right now in another window. Nothing impresses math professors more than beautiful typeset math formulas...and its sooo easy to do with tex/latex/lyx.
GNU TeXmacs is also interesting for such work, and can interface with CAS (as can Lyx) like Maxima, Axiom, and Yacas.