1.

Letvec(a),vec(b),vec(c )be unit such thathat(a) + hat(b ) + hat(c ) = vec(alpha)andhat(a).hat(b)=hat(b).hat(c ) . hat(a) = 1/2| (hat(a) xx hat(b)) xx hat(c)|is equal to -

Answer»

0
`1/2`
1
2

Answer :B


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