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`[tex]f(x)=\int_{-\infty}^xe^{-t^2}dt[/tex]`

I good resource to learn how to do LaTeX is found here:

http://en.wikipedia.org/wiki/Help:Displaying_a_formula

Also, if you right click and look at the properties of a LaTeX image on physicsgre.com you can see the code used to generate the LaTeX image.