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The second directional derivative of f(x, y) is DJ 2f(x, y) = Du[Duf(x, y)]. If f ( x, y) = x3 + 5x2y + y3

The second directional derivative of f(x, y) is DJ 2f(x, y) = Du[Duf(x, y)]. If f ( x, y) = x3 + 5x2y + y3 and u= 5 12 calculate Dyzf(1, 2). 13' 13

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