- #1

yaho8888

- 62

- 0

## Homework Statement

lim (x^2+y^2)/((root(x^2+y^2+1) - 1)

(x,y)-->(0,0)

what is the limit

## Homework Equations

none

## The Attempt at a Solution

[tex]

\lim_{(x,y) \to (0,0)} \frac {x^2 + y^2}{\sqrt{x^2 + y^2 + 1} - 1} = \lim_{r \to 0} \frac {r^2}{\sqrt{r^2 + 1} - 1}

[/tex]

I got this far the answer are 2 but i don't know how it is 2.