Un article de Wikipédia, l'encyclopédie libre.
Cet article donne les primitives de fonctions logarithmes.
![{\displaystyle \forall n\in \mathbb {Z} \setminus \{-1\},\quad \int (\ln x)^{n}~{\frac {\mathrm {d} x}{x}}={\frac {(\ln x)^{n+1}}{n+1}}+C}](https://wikimedia.org/api/rest_v1/media/math/render/svg/3e906aedce143f049af8dfd0650c2f3573907b4b)
![{\displaystyle \forall m\in \mathbb {Z} \setminus \{-1\},\forall n\in \mathbb {N} ,\quad \int (\ln x)^{n}x^{m}~\mathrm {d} x=x^{m+1}\sum _{k=0}^{n}{\frac {(-1)^{n-k}n!}{(m+1)^{n-k+1}k!}}(\ln x)^{k}+C}](https://wikimedia.org/api/rest_v1/media/math/render/svg/68b76faed662cb3806f86d73248f10b5d61b5bdb)
![{\displaystyle \forall n\in \{2,3,\ldots \},\quad \int {\frac {x^{m}}{(\ln x)^{n}}}~\mathrm {d} x=-x^{m+1}\sum _{k=1}^{n-1}{\frac {(k-1)!(m+1)^{n-1-k}}{(n-1)!(\ln x)^{k}}}+{\frac {(m+1)^{n-1}}{(n-1)!}}\int {\frac {x^{m}}{\ln x}}~\mathrm {d} x+C}](https://wikimedia.org/api/rest_v1/media/math/render/svg/e3fd7838e11b9ef05288d44894b9a2ac651f3fe1)
![{\displaystyle {\text{et}}\quad \int {\frac {x^{m}}{\ln \,x}}~\mathrm {d} x=\ln |\ln \,x|+\sum _{n=1}^{+\infty }{\frac {(m+1)^{n}(\ln \,x)^{n}}{n!\cdot n}}+C}](https://wikimedia.org/api/rest_v1/media/math/render/svg/d5d84199edc58dcf499bb7accc0aef133f77900b)
![{\displaystyle \forall a\neq 0,\quad \int \mathrm {e} ^{ax}\ln x~\mathrm {d} x={\frac {1}{a}}\mathrm {e} ^{ax}\ln |x|-{\frac {1}{a}}\int {\frac {\mathrm {e} ^{ax}}{x}}~\mathrm {d} x}](https://wikimedia.org/api/rest_v1/media/math/render/svg/ea6e6351ada7d9eb08cd8164cd84b8e25301381d)
(en) Milton Abramowitz et Irene Stegun, Handbook of Mathematical Functions with Formulas, Graphs, and Mathematical Tables [détail de l’édition] (lire en ligne)