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  4. Let ABCD be a parallelogram such that AB = vecq, AD = vecp and ∠BAD be an acute angle. If vecr is the vector that coincides with the altitude directed from the vertex B to the side AD, then vecr is given by :

Q. Let be a parallelogram such that and be an acute angle. If is the vector that coincides with the altitude directed from the vertex to the side , then is given by :

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