Find the gradient of f(x,y,z)=ln(x2+y2+z2)f(x, y, z) = \ln(x^2 + y^2 + z^2)f(x,y,z)=ln(x2+y2+z2) at (1,1,1)(1, 1, 1)(1,1,1).
⟨2/3,2/3,2/3⟩\langle 2/3, 2/3, 2/3 \rangle⟨2/3,2/3,2/3⟩
⟨1/3,1/3,1/3⟩\langle 1/3, 1/3, 1/3 \rangle⟨1/3,1/3,1/3⟩
⟨2,2,2⟩\langle 2, 2, 2 \rangle⟨2,2,2⟩
⟨1,1,1⟩\langle 1, 1, 1 \rangle⟨1,1,1⟩