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202 B
TeX

\documentclass[12pt]{article}
\pagestyle{empty}
\begin{document}
\begin{displaymath}
1/3 \left[ 1 + 2\, \left\{ 1 - (\sigma t)^2 \right\}\right]\, e^{-(\sigma t)^2/2}~
\end{displaymath}
\end{document}