Determine the gradient vector of f(x,y)=ln(x2+y2)f(x, y) = \ln(x^2 + y^2)f(x,y)=ln(x2+y2) at (1,0)(1, 0)(1,0).
⟨1,0⟩\langle 1, 0 \rangle⟨1,0⟩
⟨2,0⟩\langle 2, 0 \rangle⟨2,0⟩
⟨0,1⟩\langle 0, 1 \rangle⟨0,1⟩
⟨1,1⟩\langle 1, 1 \rangle⟨1,1⟩