TeX

Some sample $\LaTeX$ here on wikidot:

(1)
\begin{align} \int_0^\infty e^{-x^2/2} dx = \sqrt{\frac{\pi}{2}} \end{align}

The indefinite integral is

(2)
\begin{align} \int e^{-x^2/2} dx = \sqrt{\frac{\pi}{2}}\text{erf}(\frac{x}{\sqrt{2}}) + c \end{align}

Where $\text{erf}(x)$ is the error function and $c\in\mathbb{R}$ is an arbitrary constant.