Limites de fonctions Flashcards

1
Q

Définition limite infinie en l’infini

A

Tout intervalle ouvert
]A;+∞[ contient toutes les valeurs de f(x) pour x assez grand
(def analogue pour la limite en -∞)

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2
Q

Définition limite finie en l’infini

A

Tout intervalle ouvert contenant la limite contient toutes les valeurs de f(x) pour x assez grand (def analogue pour la limite en -∞)

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3
Q

Définition limite infinie en a

A

Tout intervalle ]A;+∞[ contient toutes les valeurs de f(x) pour x assez proche de a (définition analogue pour une limite -∞)

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4
Q

La courbe de f a une asymptote horrizontale quand …

A

f a une limite finie en l’infini

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5
Q

La courbe de f a une asymptote verticale quand …

A

f a une limite infinie en a

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6
Q

lim( √x )= …

x→+∞

A

+∞

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7
Q

(avec n un entier naturel non nul)
lim( x^n )= …
x→-∞

A

-∞ si n est impair

+∞ si n est pair

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8
Q

(avec n un entier naturel non nul)
lim( x^n )= …
x→+∞

A

+∞

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9
Q

lim( e^x )= …

x→+∞

A

+∞

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10
Q

lim( 1/x^n )= …

x→±∞

A

0

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11
Q

lim( 1/√x )= …

x→+∞

A

0

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12
Q

lim( 1/x )= …

x→0

A

+∞ si x>0

-∞ si x<0

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13
Q

lim( e^x )= …

x→-∞

A

0

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14
Q

lim( e^x/x^n )= …

x→+∞

A

+∞

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15
Q

lim( x^n e^x )= …

x→-∞

A

0

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16
Q

f(x)≤g(x) sur [A;+∞[
lim f(x) = +∞ alors lim g(x) = …
x→±∞/a x→±∞/a

A

+∞

17
Q

f(x)≤g(x) sur [A;+∞[
lim f(x) = -∞ alors lim g(x) = …
x→±∞/a x→±∞/a

A

-∞

18
Q

Théorème des gendarmes

A

f(x)≤g(x)≤h(x)
lim f(x) = lim h(x) = l alors lim g(x)=l
x→±∞/a x→±∞/a x→±∞/a