- #1

- 373

- 0

## Homework Statement

Find domain of [tex]\sum_{n= 0}^\infty \frac{(-1)^{n}x^{2n}}{2^{2n}(n!)^{2}}[/tex]

## Homework Equations

## The Attempt at a Solution

I set it all up but I can't really seem to simplify it.

[tex]\frac{(-1)^{n+1}x^{2(n+1)}}{2^{2n+2}(n+1)!^{2}}\bullet\frac{2^{2n}(n!)^{2}}{(-1)^{n}x^{2n}} [/tex]