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BANQUE ÉPREUVE ORALE DE MATHÉMATIQUES SESSION 2020 ... )) est une base orthonormée de E. Corrigé exercice 78. 1. Soit u ? L(E) tel que ?(x, y) ? E2, (u(x)|u(y)) = (x|y). (a) Soit (x, y) ? E2. On a, d'une part 
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