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Let DeltaOAB be an equilateral triangle ...

Let `DeltaOAB` be an equilateral triangle with side length unity (O being the origin). Also, M and N being closer to A and N being clower to B. position vectors of A, B, M and N are `veca, vecb, vecm and vecn` respectively, then the value of `vecm.vecn` is equal to

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