Calculate the gradient vector of f(x,y)=ye−xf(x,y) = y e^{-x}f(x,y)=ye−x at the point (0,2)(0, 2)(0,2).
⟨−2,1⟩\langle -2, 1 \rangle⟨−2,1⟩
⟨2,1⟩\langle 2, 1 \rangle⟨2,1⟩
⟨−2,0⟩\langle -2, 0 \rangle⟨−2,0⟩
⟨0,1⟩\langle 0, 1 \rangle⟨0,1⟩