Answers: 3
![P^{-1}=\left[\begin{array}{ccc}a&b&c\\d&e&f\\g&h&i\end{array}\right].](/tpl/images/0230/2740/3812a.png)
![P=\left[\begin{array}{ccc}a&d&g\\b&e&h\\c&f&i\end{array}\right] .](/tpl/images/0230/2740/3174b.png)
![P^T=\left[\begin{array}{ccc}a&b&c\\d&e&f\\g&h&i\end{array}\right].](/tpl/images/0230/2740/08698.png)
![P^{-1}=P^T=\left[\begin{array}{ccc}a&b&c\\d&e&f\\g&h&i\end{array}\right].](/tpl/images/0230/2740/1bddb.png)
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Find p-1, where p = [adg beh cfi] is orthogonal....
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