√√3 1 5.(2.6) (1) Let f(x, y) = ln(x² + y³) and v = derivative of f in the direction of v at x0 = Find Vf(x, y) and the directional = (2, 1). (0, 1). (2) Consider a curve given by x2 − 2xy + y³ = 1. Find a normal vector to the curve at x0 = 2

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