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Prove that [vecaxxvecb, vecbxxvecc, vecc...

Prove that `[vecaxxvecb, vecbxxvecc, veccxxveca] = [[veca.veca, veca.vecb, veca.vecc], [veca.vecb,vecb.vecb, vecb.vecc], [veca.vecc, vecb.vecc,vecc.vecc]] = [veca, vecb, vecc]^2`,Hence show that vectors `vecaxxvecb, vecbxxvecc, veccxxveca` are non-coplanar if and only if vectors `veca, vecb, vecc` are non-coplanar

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