Let, veca , vecb and vecc be three non z...

Let,` veca , vecb and vecc` be three non zero vectors such that `vecc` is a unit vector perpendicular to both `veca and vecb.` if the angle between `veca and vecb` is `pi//6,` prove that `[vec a vecb vecc ]^(2) =1/4 |veca|^(2)|vecb|^(2)`

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