Hello. I have been learning to use my new HP 50g and then I found out that I can't execute any command from the CAT menu such as EXPLN; COLLECT; FACTOR etc. For example even if I use echo of let's say EXPLN (cos(X)) it gives me exactly the same answer: EXPLN (cos(X)) and no error or anything else is mentioned on the screen. I think the problem is any of the flags, but I've tried changing everything and I still can't find how to fix this problem. I hope someone can help me.. =}
CAS commands don't work
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