HP-50g derivatives

[JurgenRo]

Hi Carsen, thanks again for your comprehensive description!

Quote:Are you doing that? Do you know how? ... Any confusion? Any more questions?

Yes, Carsen, I'm doing that, I'm using the derivative function triggered by ∂. And the procedures suggested by you, both in RPN and in ALG mode, work for me just fine as well. Furthermore, I do understand the logic behind the procedures (especially the reason why the variabel has to be equipped wit tick marks before putting it on the stackof) - even though to have the EXPAN-function wrapped around the derivative to make it work is odd - and exactly that is what I do not understand from an Logical Point of view:
'T' S^2 STO '∂T(sin(T))' ENTER EXPAN should - RPN-Logic wise - be the same as 'T' S^2 STO 'EXPAN(∂T(sin(T)))' ENTER - but it isn't. For me this is an inconsitency in the derivative function.

Anyway, thank you very much again for figuring out this "glitch" and showing ways how to circumnavigate this :-)