Таблица с интеграли на рационални функции

Шаблон:Без източници Следващата таблица на интеграли (примитивни функции) с рационална функция. За по-пълна таблица на интеграли, виж Таблични интеграли.

$\int (ax+b{)}^{n}dx$	$=\frac{(ax+b{)}^{n+1}}{a(n+1)}\text{(for }n\ne -1\text{)}$
$\int \frac{1}{ax+b}dx$	$=\frac{1}{a}\ln |ax+b|$
$\int x(ax+b{)}^{n}dx$	$=\frac{a(n+1)x-b}{a^2(n+1)(n+2)}(ax+b{)}^{n+1}\text{(for }n\in ̸\{-1,-2\}\text{)}$

$\int \frac{x}{ax+b}dx$	$=\frac{x}{a}-\frac{b}{a^2}\ln |ax+b|$
$\int \frac{x}{(ax+b{)}^2}dx$	$=\frac{b}{a^2(ax+b)}+\frac{1}{a^2}\ln |ax+b|$
$\int \frac{x}{(ax+b{)}^n}dx$	$=\frac{a(1-n)x-b}{a^2(n-1)(n-2)(ax+b{)}^{n-1}}\text{(for }n\in ̸\{1,2\}\text{)}$

$\int \frac{x^2}{ax+b}dx$	$=\frac{1}{a^3}(\frac{(ax+b{)}^2}{2}-2b(ax+b)+b^2\ln |ax+b|)$
$\int \frac{x^2}{(ax+b{)}^2}dx$	$=\frac{1}{a^3}(ax+b-2b\ln |ax+b|-\frac{b^2}{ax+b})$
$\int \frac{x^2}{(ax+b{)}^3}dx$	$=\frac{1}{a^3}(\ln |ax+b|+\frac{2b}{ax+b}-\frac{b^2}{2(ax+b{)}^2})$
$\int \frac{x^2}{(ax+b{)}^n}dx$	$=\frac{1}{a^3}(-\frac{(ax+b{)}^{3-n}}{(n-3)}+\frac{2b(a+b{)}^{2-n}}{(n-2)}-\frac{b^2(ax+b{)}^{1-n}}{(n-1)})\text{(for }n\in ̸\{1,2,3\}\text{)}$

$\int \frac{1}{x(ax+b)}dx$	$=-\frac{1}{b}\ln \left|\frac{ax+b}{x}\right|$
$\int \frac{1}{x^2(ax+b)}dx$	$=-\frac{1}{bx}+\frac{a}{b^2}\ln \left|\frac{ax+b}{x}\right|$
$\int \frac{1}{x^2(ax+b{)}^2}dx$	$=-a(\frac{1}{b^2(ax+b)}+\frac{1}{a{b}^{2}x}-\frac{2}{b^3}\ln \left|\frac{ax+b}{x}\right|)$
$\int \frac{1}{x^2+a^2}dx$	$=\frac{1}{a}\arctan \frac{x}{a}$
$\int \frac{1}{x^2-a^2}dx=$	$-\frac{1}{a}\mathrm{a}\mathrm{r}\mathrm{c}\mathrm{t}\mathrm{a}\mathrm{n}\mathrm{h}\frac{x}{a}=\frac{1}{2a}\ln \frac{a-x}{a+x}\text{(for }|x|<|a|\text{)}$
	$-\frac{1}{a}\mathrm{a}\mathrm{r}\mathrm{c}\mathrm{c}\mathrm{o}\mathrm{t}\mathrm{h}\frac{x}{a}=\frac{1}{2a}\ln \frac{x-a}{x+a}\text{(for }|x|>|a|\text{)}$

$\int \frac{1}{a{x}^2+bx+c}dx=$	$\frac{2}{\sqrt{4ac-b^2}}\arctan \frac{2ax+b}{\sqrt{4ac-b^2}}\text{(for }4ac-b^2>0\text{)}$
	$-\frac{2}{\sqrt{b^2-4ac}}\mathrm{a}\mathrm{r}\mathrm{c}\mathrm{t}\mathrm{a}\mathrm{n}\mathrm{h}\frac{2ax+b}{\sqrt{b^2-4ac}}=\frac{1}{\sqrt{b^2-4ac}}\ln \left|\frac{2ax+b-\sqrt{b^2-4ac}}{2ax+b+\sqrt{b^2-4ac}}\right|\text{(for }4ac-b^2<0\text{)}$
	$-\frac{2}{2ax+b}\text{(for }4ac-b^2=0\text{)}$
$\int \frac{x}{a{x}^2+bx+c}dx$	$=\frac{1}{2a}\ln |a{x}^2+bx+c|-\frac{b}{2a}\int \frac{dx}{a{x}^2+bx+c}$

$\int \frac{mx+n}{a{x}^2+bx+c}dx=$	$\frac{m}{2a}\ln |a{x}^2+bx+c|+\frac{2an-bm}{a\sqrt{4ac-b^2}}\arctan \frac{2ax+b}{\sqrt{4ac-b^2}}\text{(for }4ac-b^2>0\text{)}$
	$\frac{m}{2a}\ln |a{x}^2+bx+c|+\frac{2an-bm}{a\sqrt{b^2-4ac}}\mathrm{a}\mathrm{r}\mathrm{t}\mathrm{a}\mathrm{n}\mathrm{h}\frac{2ax+b}{\sqrt{b^2-4ac}}\text{(for }4ac-b^2<0\text{)}$
	$\frac{m}{2a}\ln |a{x}^2+bx+c|-\frac{2an-bm}{a(2ax+b)}\text{(for }4ac-b^2=0\text{)}$

$\int \frac{1}{(a{x}^2+bx+c{)}^n}dx=\frac{2ax+b}{(n-1)(4ac-b^2)(a{x}^2+bx+c{)}^{n-1}}+\frac{(2n-3)2a}{(n-1)(4ac-b^2)}\int \frac{1}{(a{x}^2+bx+c{)}^{n-1}}dx$

$\int \frac{x}{(a{x}^2+bx+c{)}^n}dx=\frac{bx+2c}{(n-1)(4ac-b^2)(a{x}^2+bx+c{)}^{n-1}}-\frac{b(2n-3)}{(n-1)(4ac-b^2)}\int \frac{1}{(a{x}^2+bx+c{)}^{n-1}}dx$

$\int \frac{1}{x(a{x}^2+bx+c)}dx=\frac{1}{2c}\ln \left|\frac{x^2}{a{x}^2+bx+c}\right|-\frac{b}{2c}\int \frac{1}{a{x}^2+bx+c}dx$

Всяка рационална функция може да се интегрира с прилагането на горните формули и с разлагане на дробни функции при интегрирането, т.е. чрез разлагането на рационалната функция до сума от функции във формата:

$\frac{ex+f}{{(a{x}^2+bx+c)}^n}$.