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$\begin{displaymath}\left ( \begin{array}{cccc} \alpha&\beta cos \omega & 0 & -\b... ...n^2 \omega & 0 & \beta cos \omega & \alpha \end{array}\right ) \end{displaymath}$

(15)

At $\omega=0$ we have (again)

$\begin{displaymath}\left ( \begin{array}{cccc} \alpha&\beta & 0 & 0\\ \beta &\a... ... \alpha & \beta \\ K & 0 & \beta & \alpha \end{array}\right ) \end{displaymath}$

Carl David
1999-06-16