Find the gradient of f(x,y,z)=xyzf(x, y, z) = xyzf(x,y,z)=xyz.
⟨xy,yz,xz⟩\langle xy, yz, xz \rangle⟨xy,yz,xz⟩
⟨yz,xz,xy⟩\langle yz, xz, xy \rangle⟨yz,xz,xy⟩
⟨x,y,z⟩\langle x, y, z \rangle⟨x,y,z⟩
⟨xyz,xyz,xyz⟩\langle xyz, xyz, xyz \rangle⟨xyz,xyz,xyz⟩