Question: Small Problem with unapply


i have a short question. It should be easy to answer.

I use unapply which works fine but it seems as it doesn't save the result. If i call  Phi := unapply(A1[1], x1, x2); this gives me: (x1, x2) -> 1 - x1 -  x2 (the function I expected)

but when i call "Phi" it just gives me the symbol for Phi and not the function. Maple uses the symbol for following calculations.

Thank you!

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