I think some can also do calculus, which is something where you can often miss a term or forget a minus, so definitely useful for checking that kind of thing.
I think my TI (yeah I did have one as the prize of some math competition...) could do some integration too but I never used it.
The thing is these crappy calculators do a poor job of pretty much everything they claim to do. Some of the functionality might help with learning, sure, but you’d better use an actual computer (including a modern smartphone). It’s not 1980s anymore...