2. (15 points) Function f(x, y) = x2 + y², unit vector u = = 4 3 5'5 (a) Find the gradient Vf and the directional deriva
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2. (15 points) Function f(x, y) = x2 + y², unit vector u = = 4 3 5'5 (a) Find the gradient Vf and the directional deriva
2. (15 points) Function f(x, y) = x2 + y², unit vector u = = 4 3 5'5 (a) Find the gradient Vf and the directional derivative Duf. (5 point) = (b) Find the tangent plane for the surface z = (10 point) f(x,y) at point (x, y, z) = (3,4, 25). ( =
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