If V=xf(u) and u=y/x, show that
x^2.d2V/dx2 + 2xy.d2V/dxdy + y^2.d2V/dy2= 0
(This a partial differentiation problem so all the d's are curly d's)
The Attempt at a Solution
I have tried to work out d2V/dx2 and the other derivatives, then multiply them by x^2 or 2xy or whatever is in front of them and then add them all together, but the answer I get is not 0.
I think the issue is I don't know how to work out d2V/dx2
to work out d2V/dx2 I am trying d/dx (dV/du . du/dx). But it does not seem to work
Any help would be appreciated