This might be a question people already asked or is obvious to experts, or is not appropriate for this forum, if so, I apologize. I am trying to calculate things like $z/(e^z1)$, or find the inverse of $x=z+ 2z+5z^2+\cdots$, expand as power series. What is the best (or favorite) software package you use to do stuff like this?

Okay, I've gathered the answers from the comments in alphabetical order.



For the TInspire CAS calculator: http://www.ticalc.org/archives/files/fileinfo/424/42499.html. 


Maple produces it. See http://www.maplesoft.com/support/help/Maple/view.aspx?path=powseries , especially the command http://www.maplesoft.com/support/help/Maple/view.aspx?path=powseries%2freversion for info. 

