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Méthode d’intégration : Changement de variable
Domaine Science Sous domaine Mathématiques
Section Scientifique Option Math-Physique
Discipline Mathématique Classe 6ème
Matériel didactique Exemples Auteur SCHOOLAP.COM
Objectif opérationnel A l’issue de la leçon, l’élève sera capable de déterminer le changement de variable d’une fonction en utilisant le principe de base en 5 minutes.
Réference Algèbre 2B, 8èd. pp 511 -512
Activité initiale

a. Rappel

xxdx

a. Rappel

x.x1/2dx             [x221321]+C

=x.1+12dx

=x3/2dx             x5/25+C=2x5/25+C

b. Motivation

Que faut-il faire pour intégrer une fonction ?

b. Motivation

Pour intégrer une fonction, il faut calculer sa primitive.

Comment peut-on calculer une intégrale ?

Pour calculer une intégrale, il faut utiliser les méthodes d’intégration

c. Annonce du sujet

Qu'allons nous étudier aujourd'hui en math ?

c. Annonce du sujet

Aujourd'hui nous allons étudier les méthodes d'intégration: changement des variables.

 

Activité principale

Quand est-ce qu’on peut utiliser la méthode par changement de variable ?

METHODES D’INTEGRATION :

1. CHANGEMENT DES VARIABLES

* La fonction à intégrer est une primitive de f(x)

* La fonction à intégrer est  un produit de f(x)

* Les facteurs dont la dérivée de l’un donne l’autre

* Est une fonction puissance (puissance d’un binôme)

* Est un quotient dont la dérivée du dénomination donne le numérateur

N.B : Si il est une fonction de x, on :

duuInIuI+C.

Quand est- ce qu’on peut utiliser la méthode par changement de variable ?

Résolution

- Il faut pour une condition préalable ;

- Différentier

- Remplacer l’inconnue par sa valeur

Exemple : calculer

∫ sin⁡(2x+3)  dx

Posons 2x + 3 = t

            2dt = dt

            dx =dt2

 ∫sin⁡ t dt2=   12∫Sin t dt   dx

                    =   12(-Cos t)+C

                    = 12 Cos (2x + 3) + C

Synthèse

Calculez :

a. ∫xdx1+x2

b. ∫xdx2+4x2

c. ∫ 4-3x dx.

Calculez ∫ Sinx.cosx.dx

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