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Let overset(to)(A),overset(to)(B)" and ...

Let `overset(to)(A),overset(to)(B)" and " overset(to)(C )` be unit vectors . If `overset(to)(A).overset(to)(B) = overset(to)(A).overset(to)(C ) =0` and that the angle between `overset(to)(B) " and " overset(to)(C )" is " pi//6.`
Then `overset(to)(A) =+-2 (overset(to)(B)xxoverset(to)(C ))`

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