Find the directional derivative of f(x, y) = x²y³ + 2x¹y at the point (4, 4) in the direction 0 = 2π/3. The gradient of fƒ is: Vƒ = (2xy³ + 8x³y Vƒ(4,4)= (2560 The directional derivative is: 1280+640sqrt(3) 3x²y² + 2x4 1280 )

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