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If veca,vecb,vecc are non coplaner, show...

If `veca,vecb,vecc` are non coplaner, show that `veca=(veca.veca)/[vecavecbvecc](vecbxxvecc)+(veca.vecb)/[vecavecbvecc](veccxxveca)+(veca.vecc)/[vecavecbvecc](vecaxxvecb)`

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