2 1 0 -1 -2 -3 -4 3 F(x, y) = 4x + 4y²j F(x, y) = 4y²i + 4xj F(x, y) = 4yi + 4x²j F(x, y) = 4x²i + 4yj 3 2 1 0 -1 -2 3 0 -1 -2 0 1 2 3 4

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