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I have been thinking would it be possible if lets say we an expression
h(x) = (x+1)^3 to get Geogebra to recognize that this consists of two functions
h(u) = u^3 and u = x+1
Is that possible ?
The same question 
In CAS you can factor(ize) or expand terms - not perfect in any cases...
e.g. Factor(x³ + 3x² + 3x + 1)
If you want to force this terms you have to define it
g(x):=x+1
f(x):=g(x)^3
What is your intension?
Its simply that if input a function which consists of two functions, such that
h(x) = f(g(x)) that I thought could be fun to see if one make the Geogebra understand that are two in one function :)
How would the user interface work for that?
I imagine some sort og decompose command?
then abs(x) is f(g(x)) being g(x)=x^2 and f((x)=sqrt(x) ?
i think there is not method for decompose
I think it is a blackbox
Sorry, I don't see a good use-case for that :(
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