Calculate the Laplacian ∇2f\nabla^2 f∇2f of the function f(x,y)=excos(y)f(x,y) = e^x \cos(y)f(x,y)=excos(y).
0
2excos(y)2e^x \cos(y)2excos(y)
−2exsin(y)-2e^x \sin(y)−2exsin(y)
exsin(y)e^x \sin(y)exsin(y)