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Multivariable & Vectormedium
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Consider the surface z=f(x,y)=x2−y2z = f(x,y) = x^2 - y^2z=f(x,y)=x2−y2. What is the directional derivative of fff at the point (1,1)(1,1)(1,1) in the direction of the vector v=⟨1,−1⟩\mathbf{v} = \langle 1, -1 \ranglev=⟨1,−1⟩?