Question

u(x,y)=log(xy+y^2show that x×dou/dox+y×dou/doy=2​​

Answer 1

Answer:

If u=log(x

2

+y

2

+z

2

), verify

∂x∂y

∂

2

u

=

∂x∂y

∂

2

u

Hope it helps...!!