Salut Paul,
Je ne pense pas que ce soit une coquille, je crois que c'est le maximum entre 0 et
![ouvrir la parenthèse numérateur de la fraction R a fois cos ouvrir la parenthèse beta fermer la parenthèse au-dessus du dénominateur 5830 fin de la fraction fermer la parenthèse puissance 1 tiers fin de l'exposant moins 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!
Comme si j'écrivais max(A,B), c'est le max entre A et B. C'est une convention d'écriture assez nord-américaine, en France on aurait plutôt tendance à écrire max(A ; B)!
N'hésite pas si tu as d'autres suspicions de coquille!
Odile