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Let \(f : \mathbb{R} \to \mathbb{R}\) be a function such that \(f(f(x - y)) = f(x) f(y) - f(x) + f(y) - xy\)
for all  x,y . Find the sum of all possible values of f(1)

 Aug 5, 2022
 #1
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The sum of all possible vaues of f(1) is 3.

 Aug 5, 2022

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