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Multivariable & Vectormedium
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Find the directional derivative of f(x,y)=x2+y2f(x, y) = x^2 + y^2f(x,y)=x2+y2 at (1,1)(1, 1)(1,1) in the direction of the vector v=⟨3,4⟩\mathbf{v} = \langle 3, 4 \ranglev=⟨3,4⟩.