What is the Laplacian of f(x,y,z)=ex+y+zf(x, y, z) = e^{x+y+z}f(x,y,z)=ex+y+z?
ex+y+ze^{x+y+z}ex+y+z
3ex+y+z3e^{x+y+z}3ex+y+z
000
ex+ey+eze^x+e^y+e^zex+ey+ez