If `veca, vecb, vecc` are three non colanar, non =null vectors, and `vecr` is any vector in

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If `veca, vecb, vecc` are three non colanar, non =null vectors, and `vecr` is any vector in space, then `(vecaxxvecb)xx(vecrxxvecc)+(vecbxxvecc)xx(vecrxxveca)+(veccxxveca)xx(vecrxxvecb)` is equal to
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