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Considererlafonctionf(x,y,z)=x6+yz. (a) Calculer f(1,2,3). (b) Determiner l'approximation lineaire de f au point (1,2,3). Utiliser cette approximation pour estimer la valeur de f (1, 01; 2,

Considererlafonctionf(x,y,z)=x6+yz. (a) Calculer f(1,2,3). (b) Determiner l'approximation lineaire de f au point (1,2,3). Utiliser cette approximation

pour estimer la valeur de f (1, 01; 2, 2; 2, 99). (c) Calculer la derivee directionnelle de f au point (1, 2, 3) dans la direction du vecteur v =

(1, 0, 1) = i k. (d) Dans quel direction est-ce que f augmente le plus rapidement au point (1, 2, 3) ? Donner

la valeur de la derivee directionnelle dans cette direction.

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