let f(x,y)=0(adsbygoogle = window.adsbygoogle || []).push({});

Why df=(∂f/∂x)dx + (∂f/∂y)dy?

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

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

# Why df=(∂f/∂x)dx + (∂f/∂y)dy?

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