[Request] Control of algebraic expressions CAS

[compsystems]

sorry for my bad English, I hope you can understand

in fact there are a little less rules to write.
>> it is true, it is possible for many cases, the idea is to show step by step the partial derivation for program educational, not intend to show the final answer, the only way is keeping the entry as entered, for example: ∂(x^3/x^2,x) -> "((x^2*∂(x^3,x))-(x^3*∂(x^2,x)))/x^2^2" y not "1"

the QUOTE instruction loses all his power, when the argument is an identifier that contains a symbolic expression.

[challenge] please can improve your command at least xcas?

QUOTE (expr) -> 'expr'

I think adding a new data type

type ('expr') -> DOM_unmodifiedSYMBOLIC

I think that would be the only "cas" that allow you to manipulate expressions, ideal for developing programs step by step, I want to write programs similar to those that are in http://www.tinspireapps.com but free