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If vec(a), vec(b) and vec(c ) are three ...

If `vec(a), vec(b)` and `vec(c )` are three unit vectors such that `vec(a).vec(b) = vec(a).vec(c ) = 0` and angle between `vec(b)` and `vec(c )` is `(pi)/(6)`, prove that `vec(a) = +-2(vec(b) xx vec(c ))`.

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