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Unit vector along veca is denoted by hat...

Unit vector along `veca` is denoted by `hata(if |veca|=1,veca` is called a unit vector). Also `veca/|veca|=hata and veca=|veca|hata`. Suppose `veca,vecb,vecc` are three non parallel unit vectors such that `vecaxx(vecbxxvecc)=1/2vecb ` and `vecpxx(vecqxxvecr)=(vecp.vecr)vecq-(vecp.vecq)vecr`. `|vecaxxvecc|` is equal to (A) `1/2` (B) `sqrt(3)/2` (C) `3/4` (D) none of these

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