Cross product parallelpiped question

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Hey guys can you help me with a question?

So far I've got, $$P_1 = \frac{1}{{P_2}^3} (\textbf{u}\times \textbf{v})\cdot((\textbf{v}\times \textbf{w})\times(\textbf{w}\times \textbf{u}))$$

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