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Prove that: [vecaxxvecb vecb xx vecc ...

Prove that: `[vecaxxvecb` `vecb xx vecc` `veccxxveca]=[vecavecbvecc]^2`

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`[vecaxxvecb" "vecbxxvecc " " veccxxveca]=(vecaxxvecb).((vecbxxvecc)xx(veccxxveca))`
`= (veca xxvecb).[[vecbveccveca]vecc-[vecbvecc vecc]veca]`
`= [veca vecbvecc]^(2)`
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