Somebody smarter than me might guess what you're talking about but I don't understand your question.
Can you make it clearer?
hmmm you may be right because english is not my native language i will try to explain it better,
first of all the function is not given but it is said it is a function with 2 variables. than it is said that f(x,y) ≤ x2+y2 . I have to find if this function that is not given has differencial in A(0,0)