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Last updated 6:27 PM on 4/12/26
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14 Terms

1
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Def ο(φ) et Ο(φ)

f est dominé par φ ssi fφ\frac{f}{\varphi} est borné, on note f=Ο(φ)

f est négligeable devant φ ssi lima fφ\frac{f}{\varphi} = 0, on note f=ο(φ)

2
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def fonction équivalenteffg\frac{f}{g}

f ∼ g ssi lima = 1

3
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Formule de Taylor-Young

Si f est de classe Cn sur I et 0 ∈ İ, alors

f(x) = Σxkf(k)(a)k!\frac{x^{k}f^{\left(k\right)}\left(a\right)}{k!} + ৹(xnx^{n} )

4
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DL(0) de 11x\frac{1}{1-x}

= 1 + x + x² + … + xn + ৹(xn)

5
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DL(0) de (1 + x)α

(1 + x)α = 1 + αx + α(α1)x22\frac{\alpha\left(\alpha-1\right)x^2}{2} + … + ৹(xn)

6
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DL(0) de ln(1 + x)

ln(1 + x) = x - x²/2 + x3/3 + … + ৹(xn)

7
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DL(0) de ex

ex = 1 + x + x²/2! + x3/3! + … + ৹(xn)

8
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DL(0) de sin(x)

sin(x) = x - x3/3! + x5/5! + … + ৹(x2n+1)

9
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DL(0) de cos(x)

cos(x) = 1 - x²/2! + x4/4! + … + ৹(x2n)

10
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DL(0) de sh(x)

sh(x) = x + x3/3! +x5/5! + … + ৹(x2n+1)

11
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DL(0) de ch(x)

ch(x) = 1 + x²/2! + x4/4! + … + ৹(x2n)

12
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Développement de 1/g

Si DLn(0) de g(x) = Σakxk + ৹(xn), alors DLn(0) de 1/g(x) existe et vaut 1/ao*1/(1 + Σakxk/ao + ৹(xn))

13
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Intégration d’un DL

f(x) = Σakxk + ৹(xn) => F(X) = F(0) + Σakxk+1/K+1 + ৹(xn+1)

14
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DL en +

Ssi φ(x) = f(1/x) admet un DL(0):

f(x) = Σak/xk + ৹((1/x)n)