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If vecl,vecm,vecn are three non coplanar...

If `vecl,vecm,vecn` are three non coplanar vectors prove that `[vecl vecm vecn](vecaxxvecb) =|(vec1.veca, vec1.vecb, vec1),(vecm.veca, vecm.vecb, vecm),(vecn.veca, vecn.vecb, vecn)|`

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