The TI-89's have the same shell as the TI-83. I took the shell off the 83 and put it on the 89 as well as replacing some of the buttons.
replyI used this on tests that banned the TI-89.
Can it do anything non-trivial? The algorithms for symbolic integration are extensive.
replyMy Casio could do numeric differentiation and integration. I used this to double check my answers in my exams.
In fact, it still can as I still own and use it to this day.
It's quite good for what it is. Of course it will lose to Mathematica but I used mine heavily throughout physics to derive things symbolically.
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