- #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.