Find the unit vector u along which the rate of change of the function f(x, y) x 2 xy 3 at the point (2,1) is maximum What is this maximum rate of change

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Find the unit vector u along which the rate of change of the function f(x, y) = x 2 + xy 3 at the point

Find the unit vector u along which the rate of change of the function f(x, y) = x² + xy³at the point (2,1) is maximum. What is this maximum rate of change?

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