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Prove that [veca+vecb vecb+vecc v...

Prove that `[veca+vecb` ` vecb+vecc` ` vecc+veca]=2[veca vecb vecc]`

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`[veca+vecb vecb +vecc " " vecc+veca]=(veca+vecb).((vecb+vecc)xx(vecc+veca))`
`=(veca+vecb).(vecbxxveccxxvecbxxveca+veccxxvecc)`
`=[veca vecbvecc]+[vecb veccveca]=2[veca vecbvecc]`
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