Problem:
Find the laplacian of the function $f(x,y,z)$ where $f(x,y,z) = \cosh ^{-1}\left(\frac{x-y}{z}\right)$
from sympy.vector import *
from sympy import *

C = CoordSys3D('C')
x, y, z = C.x, C.y, C.z
f = acosh((x-y)/z)
print(laplacian(f))
