Epreuve de Mathématiques B L'usage de calculatrices est interdit.
(b) Soit V : (x, y, z) ?? (P(x, y, z),Q(x, y, z),R(x, y, z)) une fonction de classe C1 appartenant `a l'image de ?. Démontrer que : ?P. ?y. = ?Q. ?x.
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