Report - Exercícios...f 2 f 1 f 0 y 0 x 1 1 f 3 f 2 f 1 f 0 f 1 f 2 f 3 y x 1 1 2.8 Exercícios y 0 y 0 y 0 y 0 x x xx (a) (b) (c) (d) I II III IV y 0 0 y 0 x x y 0 x x; É necessário usar

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