Show that \( \Delta=\left|\begin{array}{lll}x & p & q \\ p & x & q ...

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Show that \( \Delta=\left|\begin{array}{lll}x & p & q \\ p & x & q \\ q & q & x\end{array}\right|=(x-p)\left(x^{2}+p x-2 q^{2}\right) \)
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