(See Solution) By about how much will the value of f(x, y)= cos (π x y)+x y^2 change if (x, y) is moved a distance of $0.1$ from (-1,-1) in the direction
Question: By about how much will the value of \(f(x, y)=\cos (\pi x y)+x y^{2}\) change if \((x, y)\) is moved a distance of $0.1$ from \((-1,-1)\) in the direction \(\langle 1,1\rangle ?\)
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(Solved) Comment on why ∇(g f)=f ∇ g+g ∇
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