Using SLOPE function in Function APP with CAS defined function

[DrD]

SLOPE() is a HOME function. Mixing HOME with CAS is just evil.

It can be done though (case matters!):

CAS View
f(x):=x^2; ---> x^2
g:=SLOPE(X^2,2); ---> 4;

Function app symbolics:
F1(X)=f(X)
F2(X)=g