be the function f(x, y) = x²y-4x³+2y, the vector v = (5, 12) and u the unit vector of v. CalculateDu(1, –2), that is , calculate the directional derivative of fin the direction of vector u 92 %3D 96 116 -24 e)- d)- 13 -44 a) 13 3 )- 13 13

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