Plot equation in Home view (e.g Function plot) using result from CAS view

[toshk]

Try this;
#cas
test(myPoly):=
BEGIN
L0:=myPoly //myPoly pass straight up to my Poly2symb cause your error; but saving it to L0 forces it to list
STARTAPP(Function); //F1 is not only reserved Var for Function App but also Spreadsheet
F1:=unapply(poly2symb(L0,x),x);
RETURN F1(x);
END;
#end

Also Function App can straight up take some built in function:
F1 type in poly2symb({1,2,3},X)