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If vecA, vecB, vecC are non-coplanar vec...

If `vecA, vecB, vecC` are non-coplanar vectors then `(vecA.vecBxxvecC)/(vecCxxvecA.vecB)+(vecB.vecAxxvecC)/(vecC.vecAxxvecB)=`

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`(vecA.vecB xx vecC)/(vecCxxvecA.vecB)+(vecB.vecAxxvecC)/(vecC.vecAxxvecB)`
`([vecA vecBvecC])/([vecA vecBvecC])+ (-[vecAvecBvecC])/([vecA vecB vecC])=0`
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