3 ms·GNU Calc (M-x calc in Emacs) is also a fairly capable CAS, and I love its RPN interface.by quotemstr 12y agoGNU Calc (M-x calc in Emacs) is also a fairly capable CAS, and I love its RPN interface.S4M 12y agoThanks for that! I didn't know it had some algebra integrated. However, it wouldn't simplify (x+1)/(-x-1) (it does simplify -x/x though).deleted 12y ago[deleted]quotemstr 12y agoTry the "a n" command.