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### Question Asked by a Student from EXXAMM.com Team

** Q 2233156942. ** If `vec(a),vec(b),vec(c)` care unit vectors and `vec(a)* vec(b) = vec(a) * vec(c) =0` and the angle

between `vec(b)` and `vec(c)` is `pi/6`. Then `vec(a) = pm 4 ( vec(b) xx vec(a) )`