Compute the Laplacian ∇2f=fxx+fyy\nabla^2 f = f_{xx} + f_{yy}∇2f=fxx+fyy for the function f(x,y)=x2−y2f(x,y) = x^2 - y^2f(x,y)=x2−y2.
0
4
-4
2x−2y2x-2y2x−2y