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If `overset(to)(A), overset(to)(B), overset(to)(C )` three non-coplanar vectors then
`(overset(to)(A) ,(overset(to)(B)xxoverset(to)(C)))/((overset(to)(C)xx overset(to)(A)). overset(to)(B))+ (overset(to)(B).(overset(to)(A) xx overset(to)(C)))/(overset(to)(C).(overset(to)(A)xx overset(to)(B)))=.........`

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`(vec(A).(vec(B)xxvec(C)))/((vec(C)xxvec(A))"."vec(B)) + (vec(B)(vec(A)xxvec(C)))/(vec(C).(vec(A)xxvec(B)))`
`=([vec(A)vec(B)vec(C)])/([vec(C)vec(A)vec(B)])+[[vec(B)vec(A)vec(C)]]/[[vec(C)vec(A)vec(B)]]=[[vec(A)vec(B)vec(C)]-[vec(A)vec(B)vec(B)]]/[[vec(C)vec(A)vec(B)]]=0`
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