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Multivariable & Vectormedium
0:00.0

Find the directional derivative of f(x,y)=xyf(x, y) = xyf(x,y)=xy at (1,2)(1, 2)(1,2) in the direction of the unit vector u=⟨35,45⟩\mathbf{u} = \langle \frac{3}{5}, \frac{4}{5} \rangleu=⟨53​,54​⟩.