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Multivariable & Vectoreasy
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If the gradient of a function at a point is ∇f=⟨2,−1⟩\nabla f = \langle 2, -1 \rangle∇f=⟨2,−1⟩, what is the directional derivative of fff in the direction of the unit vector u=⟨35,45⟩\mathbf{u} = \langle \frac{3}{5}, \frac{4}{5} \rangleu=⟨53​,54​⟩?