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Possible Duplicate:
Using display style fraction in a matrix environment

How do I create a left brace for an array such that it surrounds all the elements of the array? This is happening whenever one of the elements is \cos with \frac as its mandatory argument.

Minimal Working Example:

\documentclass{article}

\usepackage{amsmath}

\begin{document}
\begin{equation*}
\mathbf{A} = \frac{1}{\sqrt{\frac{n}{2}}} \left[
\begin{array}{c}
1 \\
\cos\frac{2\pi}{n} \\
\vdots \\
\cos\frac{2\pi(n-1)}{n}
\end{array}
\right.
\end{equation*}
\end{document}

Thanks.

marked as duplicate by Werner, Tom Bombadil, Stephan Lehmke, Martin Schröder, Peter Grill Sep 10 '12 at 7:33

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  • From what I can gather, the various solutions are: placing \struts in the argument of the fractions, applying \arraystretch, and inserting lines with narrow height to increase the spacing manually. The cause of the issue is characters being drawn outside of the bounding box. – jrand Sep 10 '12 at 5:15

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