What is the Laplacian ∇2f\nabla^2 f∇2f of the function f(x,y,z)=x2+2y2+3z2f(x, y, z) = x^2 + 2y^2 + 3z^2f(x,y,z)=x2+2y2+3z2?
666
2x+4y+6z2x + 4y + 6z2x+4y+6z
121212
000