I have gotten a number of requests for various additional LaTeX packages that aren't supported by this page, so I need to explain something. This page doesn't generate LaTeX renderings, it only accepts plain-text entries and submits them to the supported renderers. I don't have any control over the packages supported by these renderers. To move beyond the limited capabilities of this page, I recommend that people download and try Texmaker, which I find to be a first-rate TeX/LaTeX editor (free, open source). For more than LaTeX rendering, for actual math as well as nice equation rendering, I recommend the free, open-source Sage mathematical toolset (my Sage tutorial).