Math Help - Partial Diff.

1. Partial Diff.

Hey guys,

What is the partial differentiation w.r.t x and y for

f(x,y) = 1/(x^2+y^2+1)

2. $f(x,y)=\left( x^{2}+y^{2}+1 \right)^{-1}\implies \frac{\partial f}{\partial x}=-\frac{2x}{\left( x^{2}+y^{2}+1 \right)^2}.$

You just treat other terms as constants. In the same fashion you can compute $\frac{\partial f}{\partial y}.$