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Will rate Calculate Duf(2, -4, 1) in the direction of 3 = -i - j + k for the function f(x, y, z) = -4x2

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Calculate Duf(2, -4, 1) in the direction of 3 = -i - j + k for the function f(x, y, z) = -4x2 + xy - 43 - 3x - 4yz + 422 + 3xz. Round your answer to four decimal places

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