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

1.	Prove that: `[vecaxxvecb vecb xx vecc veccxxveca]=[vecavecbvecc]^2`
Answer» `[vecaxxvecb" "vecbxxvecc " " veccxxveca]=(vecaxxvecb).((vecbxxvecc)xx(veccxxveca))` `= (veca xxvecb).[[vecbveccveca]vecc-[vecbvecc vecc]veca]` `= [veca vecbvecc]^(2)`

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

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