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Primitives de fonctions irrationnelles - Wikipédia

Primitives de fonctions irrationnelles

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Cet article fait partie de la série
Primitives de fonctions
Rationnelles
Logarithmes
Exponentielles
Irrationnelles
Trigonométriques
Hyperboliques
Circulaires réciproques
Hyperboliques réciproques

On suppose a≠0.

\int (ax+b)^{\alpha}\,dx=\frac{1}{(\alpha+1)a}(ax+b)^{\alpha+1}+C (α≠-1)
\int \frac{1}{\sqrt{ax^2+bx+c}}\, dx=
=\left\{\begin{matrix}\frac{1}{\sqrt{a}}\operatorname{argsh}\frac{2ax+b}{\sqrt{-(b^2-4ac)}} +C & \rm{\, si \,} & b^2-4ac<0 & \rm{\, et \,} & a>0\\ \frac{1}{\sqrt{a}}\ln|2ax+b| +C & \rm{\, si \,} & b^2-4ac=0 & \rm{\, et \,} & a>0\\-\frac{1}{\sqrt{-a}}\operatorname{Arcsin}\frac{2ax+b}{\sqrt{b^2-4ac}}     +C &\rm{\, si \,} & b^2-4ac>0 & \rm{\, et \,} & a<0\\\end{matrix}\right.
\int \sqrt{ax^2+bx+c}\,dx=\frac{2ax+b}{4a}\sqrt{ax^2+bx+c}-\frac{b^2-4ac}{8a}\int\frac{1}{\sqrt{ax^2+bx+c}}\,dx
\int \frac{x}{\sqrt{ax^2+bx+c}}\,dx=\frac{\sqrt{ax^2+bx+c}}{a}-\frac{b}{2a}\int\frac{1}{\sqrt{ax^2+bx+c}}\,dx

On suppose a>0

\int \frac{1}{\sqrt{a^2-x^2}}\,dx=\operatorname{Arcsin}\frac{x}{a}+C
\int \frac{1}{\sqrt{a^2+x^2}}\,dx=\operatorname{argsh}\frac{x}{a}+C
\int \frac{1}{\sqrt{x^2-a^2}}\,dx=\operatorname{argch}\frac{x}{a}+C
\int \sqrt{a^2-x^2}\,dx=\frac{x}{2}\sqrt{a^2-x^2}+\frac{a^2}{2}\operatorname{Arcsin}\frac{x}{a}+C
\int \sqrt{a^2+x^2}\,dx=\frac{x}{2}\sqrt{a^2+x^2}+\frac{a^2}{2}\operatorname{argsh}\frac{x}{a}+C
\int \sqrt{x^2-a^2}\,dx=\frac{x}{2}\sqrt{x^2-a^2}-\frac{a^2}{2}\operatorname{argch}\frac{x}{a}+C
\int x\sqrt{a^2+x^2}\,dx=\frac{1}{3}\sqrt{(a^2+x^2)^3}+C
\int x\sqrt{a^2-x^2}\,dx=-\frac{1}{3}\sqrt{(a^2-x^2)^3}+C
\int x\sqrt{x^2-a^2}\,dx=\frac{1}{3}\sqrt{(x^2-a^2)^3}+C
\int \frac{1}{x}\sqrt{a^2+x^2}\,dx=\sqrt{a^2+x^2}-a\ln\left|\frac{1}{x}\left(a+\sqrt{a^2+x^2}\right)\right|+C
\int \frac{1}{x}\sqrt{a^2-x^2}\,dx=\sqrt{a^2-x^2}-a\ln\left|\frac{1}{x}\left(a+\sqrt{a^2-x^2}\right)\right|+C
\int \frac{1}{x}\sqrt{x^2-a^2}\,dx=\sqrt{x^2-a^2}-a\operatorname{Arccos}\frac{a}{x}+C
\int \frac{x}{\sqrt{a^2-x^2}}\,dx=-\sqrt{a^2-x^2}+C
\int \frac{x}{\sqrt{a^2+x^2}}\,dx=\sqrt{a^2+x^2}+C
\int \frac{x}{\sqrt{x^2-a^2}}\,dx=\sqrt{x^2-a^2}+C
\int \frac{x^2}{\sqrt{a^2-x^2}}\,dx=-\frac{x}{2}\sqrt{a^2-x^2}+\frac{a^2}{2}\operatorname{Arcsin}\frac{x}{a}+C
\int \frac{x^2}{\sqrt{a^2+x^2}}\,dx=\frac{x}{2}\sqrt{a^2+x^2}-\frac{a^2}{2}\operatorname{argsh}\frac{x}{a}+C
\int \frac{x^2}{\sqrt{x^2-a^2}}\,dx=\frac{x}{2}\sqrt{x^2-a^2}+\frac{a^2}{2}\operatorname{argch}\frac{x}{a}+C
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