New Casio fx-9860 GIII model

[Csaba Tizedes]

Just one question: it can numerically differentiate only by variable 'x' or by any?

EDIT:

Yes, as I guess before: there is no any update in the software. What CASIO want with this OS? For educational purposes, the CASIO is failed. I can't understand, how the CASIO think that their calculators will be used in education?! Eg. in the high school how do you want to perform a local extremum find on a plane without differentiation by any variable (at least x AND y)?

Nonsense.
Useless.
Waste of money.

Csaba