1.

Let vecalpha,vecbeta,vecgamma be three unit vectors such that vecalpha*vecbeta=vecalpha*vecgamma=0 and the angle between vecbeta and vecgamma is 30^(@). Then vecalpha is

Answer»

`2(VECBETA XX vecgamma)`
`-2(vecbeta xx vecgamma)`
`pm2(vecbeta xx vecgamma)`
`(vecbeta xx vecgamma)`

Answer :C


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