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1666724786535_math analyse

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45

∫ ln2 x

x

dx

= ∫ 1 x . ln2 x dx

1

2+1 ln3 x + c

1 3 ln3 x + c

∫ 1

x lnx dx

= ∫

1

x

lnx dx

= ln|ln x| + c

∫ x2

x 2 +1 dx

∫ (x2 +1)−1

dx

x 2 +1

∫ x2 +1

− 1

dx

x 2 +1 x 2 +1

∫ 1 − 1

dx x 2 +1

= x − arctan x + c

3. Primitives par partie :

I = ∫ u. v ′ dx

u ⟼ u′

⟹ I = u. v′ ∫ u ′ . v dx

v′ ⟼ v

Exemple :

1. I = ∫ xe x dx

u: x ⟼ u ′ = 1

v ′ : e x ⟼ v = e x

I = xe x − ∫ e x dx = xe x − e x + c

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