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Multivariable & Vectoreasy
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What is the directional derivative of f(x,y)=3x−4yf(x,y) = 3x - 4yf(x,y)=3x−4y in the direction of the unit vector u=⟨35,45⟩\mathbf{u} = \langle \frac{3}{5}, \frac{4}{5} \rangleu=⟨53​,54​⟩?