Not a Problem
f(x)=g(x) sqrt($1) x_1:=RechteSeite($2) x_0:=2x_1 is unkown in algebra window
so I defined x_0:=2 and after that changed x_0:=RightSide($2) to have x_0 in algebra window - but x_0 do not compute by changes to g(x) g(x)=4
Files:
geogebra-export.ggb
The same problem 
x_0:=2 define x_0 to be a number then rightside($2) is converted to number. then g(x)=4 is a function and x_0 is not updated.
x_1:=rigthside($2) do x_1 to be a function then is not in algebra view. if you do click in white dot of row 3 then x_1 is renamed as function by default.
I think you must decide if you want a number or a function at beginning
I think there is a problem when a variable defined in the Cas window does not appear in algebra window!
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