Using \frac within tabular [duplicate]

Question

Possible Duplicate:
Using \frac within a table

I'm trying to do that within CodeCogs renderer, but it don't work:

\begin{tabular}{cc} \hline \frac{x}{2} & \frac{2}{x} \\ \hline \end{tabular}

How can I fix that? Thank you!

Answer 1

Use $...$ or the tabular column definition

\documentclass[12pt]{article}
\usepackage{array,amsmath}
\def\xstrut{\rule[-2ex]{0pt}{5ex}}

\begin{document}

\begin{tabular}{ c >{\xstrut$}c<{$}} \hline 
 $\frac{x}{2}$ & \frac{2}{x} \\ \hline
 $\dfrac{x}{2}$ & \dfrac{2}{x} \\ \hline 
\end{tabular}

\end{document}