%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                               
%            Shizuoka University 
%       ----KANEKO & YAMASHITA LAB.----
%        Author: TSUCHIYA, Toru
%     File Name: rensyu14.tex
% Last Modified: Wed, 06 Jun 2007 16:34:28 +0900
%                                               
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\documentclass[a4j]{jarticle}
\usepackage{amsmath}

\begin{document}

\[
 \text{座標の回転：}R(\theta)
 \left(
\begin{array}{c}
x \\
y
\end{array}
\right)
=
\left(
\begin{array}{cc}
\cos\theta & \sin\theta \\
-\sin\theta & \cos\theta
\end{array}
\right)
\left(
\begin{array}{c}
x \\
y
\end{array}
\right)
\]

%%次のように\begin{pmatrix}を使って括弧の記述を省略することもできます。
%%また{ccc}等の設定も不要で、動的に行列の大きさが変わります。

別の記述方法による出力例
\[
 \text{座標の回転：}R(\theta)
\begin{pmatrix}
 x \\
 y
\end{pmatrix}
=
\begin{pmatrix}
\cos\theta & \sin\theta \\
-\sin\theta & \cos\theta
\end{pmatrix}
\begin{pmatrix}
x \\
y
\end{pmatrix}
\]

\end{document}

