4. (30%) For the given scalar field f calculate the Laplacian 2 f

f(x1, x2, x3) = x1x2

2

+ x2 cosx3 + ex1x3

f(x1, x2, x3) = sin(x1) sin(x2) sin(x3)

(30%) For the given scalar field f calculate the Laplacian 2f f(x1,x2,x3)=x1x22+x2cosx3+ex13f(x1,x2,x3)=sin(x1)sin(x2)sin(x3)