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if overset(to)(b) " and " overset(to)(c...

if `overset(to)(b) " and " overset(to)(c )` are any two non- collinear unit vectors and `overset(to)(a)` is any vector then
`(overset(to)(a).overset(to)(b))overset(to)(b).(overset(to)(a).overset(to)(c )) overset(to)(c ) + .(overset(to)(a).(overset(to)(b)xxoverset(to)(c)))/(|overset(to)(b)xxoverset(to)(c)|^(2)).(overset(to)(b)xxoverset(to)(c))=.........`

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