I need help

[ajazzabi]

Hey,

I'm using a casio 991 calculator for calculating derivatives but it always returns numeric values.
Is there any way to get the derivative formula?




https://ibb.co/fVFusT

I was hoping to get a return value in that form. Can i do it with my Casio 991 or do I need to buy another calculator, if so, which do you recommend?

Thanks!

[Maximilian Hohmann]

Hello!

I am not really familiar with Casio calculators, but to me it seems that your FX-991 is a "normal" (although quite capable) scientific calculator. For symbolic calculations as you intend to perform a calculator with "CAS" capability (= Computer Algebra System) would be required. If you want to stay with Casio then the ClassPad II (FX-CP400) would be the way to go. Otherwise the HP-50g, HP Prime, Ti nSpire, Ti-89, Ti Voyage 200 among some others might be candidates. Personally I like the Ti Voyage 200 a lot and they can be found second hand at bargain prices.

Regards
Max

[klesl]

a small correction: TI- Nspire CX CAS

[foroplus]

I don't think you can get the derivative formula even with the last model of 991 (Classwiz)