Determine the gradient of the function f(x,y)=yxf(x,y) = \frac{y}{x}f(x,y)=xy at the point (1,2)(1, 2)(1,2).
⟨−2,1⟩\langle -2, 1 \rangle⟨−2,1⟩
⟨2,1⟩\langle 2, 1 \rangle⟨2,1⟩
⟨−1,2⟩\langle -1, 2 \rangle⟨−1,2⟩
⟨1,−2⟩\langle 1, -2 \rangle⟨1,−2⟩