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

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) = pm 2 ( vec(b) xx vec(c ))`

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