I think I'll get banned soon posting multiple questions at the same time, but allow me to continue,(adsbygoogle = window.adsbygoogle || []).push({});

if f,g:R-->R both of class C2(differentiable twice)

Define F(x,y)=f(x+g(y))

Show that (DxF)(DxDyF)=(DyF)(D^2xF) where D^2xF is second order partial derivative with respect to x

I'm dying here...

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Another question thrown at you

**Physics Forums | Science Articles, Homework Help, Discussion**