For comparison, this is mathtran.js: $tex: f(x) = \frac1{\sigma\sqrt{2\pi}} \int_{-\infty}^x e^{-\frac{(t-\mu)^2}{2\sigma^2}}dt$

This is mimetex.cgi: $f(x) = \frac1{\sigma\sqrt{2\pi}} \int_{-\infty}^x e^{-\frac{(t-\mu)^2}{2\sigma^2}}dt$