1.

Let vec(alpha),vec(beta),vec(gamma) be three unit vectors such that vec(alpha).vec(beta)=vec(alpha).vec(gamma)=0 and the angle between vec(beta)andvec(gamma) is 30^(@)." Then "vec(alpha) is

Answer»

`2(VEC(BETA)xxvec(gamma))`
`-2(vec(beta)xxvec(gamma))`
`+-2(vec(beta)xxvec(gamma))`
`(vec(beta)xxvec(gamma))`

Answer :C


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