Question

Find the first partial derivative of the function. f(r,s)=r*ln(r^2+s^2)

Answer 1

\[f(r,s) = r*\ln(g(r,s))\]\[\frac{\partial{f(r,s)}}{\partial{r}} = \ln(g(r,s))+r*\frac{\frac{\partial{g(r,s)}}{\partial{r}}}{g(r,s)}\]

Answer 2

why couldnt it have been for s lol

Answer 3

I need r and s!

Answer 4

first find the derivative of r (treat s as a constant) what do you get?