Question
Question A4
Write a function f: {-2,–1,0,1, 2} → Z such that f and its square f2
are injective but ƒ – f² is not.
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Question A4 Write a function f: {-2,–1,0,1, 2} → Z such that f and its square f2 are injective but ƒ – f² is not.

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