1.

If r is a unit vector satisfying r xx a =b , |a|=2 and |b| = sqrt3, theone such r =

Answer»

`1/4[(2A+( bxx a)]`
`1/4[a-(2bxxa )]`
`1/3 [a-(b XXA)]`
`1/4 [a-( BXXA )]`

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