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If veca,vecb,vecc are non-coplanar vecto...

If `veca,vecb,vecc` are non-coplanar vectors and `vecu` and `vecv` are any two vectors. Prove that `vecuxxvecv=(1)/([vecavecbvecc])|{:(vecu.veca,vecv.veca,veca),(vecu.vecb,vecv.vecb,vecb),(vecu.vecc,vecv.vecc,vecc):}|`

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