Integration is the basic operation in
integral calculus . While
differentiation has straightforward
rules by which the derivative of a complicated
function can be found by differentiating its simpler component functions, integration does not, so tables of known integrals are often useful. This page lists some of the most common
antiderivatives .
Historical development of integrals
A compilation of a list of integrals (Integraltafeln) and techniques of integral calculus was published by the German mathematician
Meier Hirsch [
de ] (aka
Meyer Hirsch [
de ] ) in 1810. These tables were republished in the United Kingdom in 1823. More extensive tables were compiled in 1858 by the Dutch mathematician
David Bierens de Haan for his
Tables d'intégrales définies , supplemented by
Supplément aux tables d'intégrales définies in ca. 1864. A new edition was published in 1867 under the title
Nouvelles tables d'intégrales définies . These tables, which contain mainly integrals of elementary functions, remained in use until the middle of the 20th century. They were then replaced by the much more extensive tables of
Gradshteyn and Ryzhik . In Gradshteyn and Ryzhik, integrals originating from the book by Bierens de Haan are denoted by BI.
Not all
closed-form expressions have closed-form antiderivatives; this study forms the subject of
differential Galois theory , which was initially developed by
Joseph Liouville in the 1830s and 1840s, leading to
Liouville's theorem which classifies which expressions have closed form antiderivatives. A simple example of a function without a closed form antiderivative is e −x 2 , whose antiderivative is (up to constants) the
error function .
Since 1968 there is the
Risch algorithm for determining indefinite integrals that can be expressed in term of
elementary functions , typically using a
computer algebra system . Integrals that cannot be expressed using elementary functions can be manipulated symbolically using general functions such as the
Meijer G-function .
Lists of integrals
More detail may be found on the following pages for the lists of
integrals :
Gradshteyn ,
Ryzhik ,
Geronimus ,
Tseytlin , Jeffrey, Zwillinger, and
Moll 's (GR)
Table of Integrals, Series, and Products contains a large collection of results. An even larger, multivolume table is the Integrals and Series by
Prudnikov ,
Brychkov , and
Marichev (with volumes 1–3 listing integrals and series of
elementary and
special functions , volume 4–5 are tables of
Laplace transforms ). More compact collections can be found in e.g. Brychkov, Marichev, Prudnikov's Tables of Indefinite Integrals , or as chapters in Zwillinger's CRC Standard Mathematical Tables and Formulae or
Bronshtein and Semendyayev 's
Guide Book to Mathematics ,
Handbook of Mathematics or
Users' Guide to Mathematics , and other mathematical handbooks.
Other useful resources include
Abramowitz and Stegun and the
Bateman Manuscript Project . Both works contain many identities concerning specific integrals, which are organized with the most relevant topic instead of being collected into a separate table. Two volumes of the Bateman Manuscript are specific to integral transforms.
There are several web sites which have tables of integrals and integrals on demand.
Wolfram Alpha can show results, and for some simpler expressions, also the intermediate steps of the integration.
Wolfram Research also operates another online service, the Mathematica Online Integrator.
Integrals of simple functions
C is used for an
arbitrary constant of integration that can only be determined if something about the value of the integral at some point is known. Thus, each function has an infinite number of
antiderivatives .
These formulas only state in another form the assertions in the
table of derivatives .
Integrals with a singularity
When there is a
singularity in the function being integrated such that the antiderivative becomes undefined or at some point (the singularity), then C does not need to be the same on both sides of the singularity. The forms below normally assume the
Cauchy principal value around a singularity in the value of C but this is not in general necessary. For instance in
∫
1
x
d
x
=
ln
|
x
|
+
C
{\displaystyle \int {1 \over x}\,dx=\ln \left|x\right|+C}
there is a singularity at 0 and the
antiderivative becomes infinite there. If the integral above were to be used to compute a definite integral between −1 and 1, one would get the wrong answer 0. This however is the Cauchy principal value of the integral around the singularity. If the integration is done in the complex plane the result depends on the path around the origin, in this case the singularity contributes −
i π when using a path above the origin and
i π for a path below the origin. A function on the real line could use a completely different value of
C on either side of the origin as in:
[1]
∫
1
x
d
x
=
ln
|
x
|
+
{
A
if
x
>
0
;
B
if
x
<
0.
{\displaystyle \int {1 \over x}\,dx=\ln |x|+{\begin{cases}A&{\text{if }}x>0;\\B&{\text{if }}x<0.\end{cases}}}
Rational functions
∫
a
d
x
=
a
x
+
C
{\displaystyle \int a\,dx=ax+C}
The following function has a non-integrable singularity at 0 for n ≤ −1 :
∫
x
n
d
x
=
x
n
+
1
n
+
1
+
C
(for
n
≠
−
1
)
{\displaystyle \int x^{n}\,dx={\frac {x^{n+1}}{n+1}}+C\qquad {\text{(for }}n\neq -1{\text{)}}}
(
Cavalieri's quadrature formula )
∫
(
a
x
+
b
)
n
d
x
=
(
a
x
+
b
)
n
+
1
a
(
n
+
1
)
+
C
(for
n
≠
−
1
)
{\displaystyle \int (ax+b)^{n}\,dx={\frac {(ax+b)^{n+1}}{a(n+1)}}+C\qquad {\text{(for }}n\neq -1{\text{)}}}
∫
1
x
d
x
=
ln
|
x
|
+
C
{\displaystyle \int {1 \over x}\,dx=\ln \left|x\right|+C}
More generally,
[2]
∫
1
x
d
x
=
{
ln
|
x
|
+
C
−
x
<
0
ln
|
x
|
+
C
+
x
>
0
{\displaystyle \int {1 \over x}\,dx={\begin{cases}\ln \left|x\right|+C^{-}&x<0\\\ln \left|x\right|+C^{+}&x>0\end{cases}}}
∫
c
a
x
+
b
d
x
=
c
a
ln
|
a
x
+
b
|
+
C
{\displaystyle \int {\frac {c}{ax+b}}\,dx={\frac {c}{a}}\ln \left|ax+b\right|+C}
Exponential functions
Logarithms
∫
ln
x
d
x
=
x
ln
x
−
x
+
C
{\displaystyle \int \ln x\,dx=x\ln x-x+C}
∫
log
a
x
d
x
=
x
log
a
x
−
x
ln
a
+
C
=
x
ln
x
−
x
ln
a
+
C
{\displaystyle \int \log _{a}x\,dx=x\log _{a}x-{\frac {x}{\ln a}}+C={\frac {x\ln x-x}{\ln a}}+C}
Trigonometric functions
∫
sin
x
d
x
=
−
cos
x
+
C
{\displaystyle \int \sin {x}\,dx=-\cos {x}+C}
∫
cos
x
d
x
=
sin
x
+
C
{\displaystyle \int \cos {x}\,dx=\sin {x}+C}
∫
tan
x
d
x
=
ln
|
sec
x
|
+
C
=
−
ln
|
cos
x
|
+
C
{\displaystyle \int \tan {x}\,dx=\ln {\left|\sec {x}\right|}+C=-\ln {\left|\cos {x}\right|}+C}
∫
cot
x
d
x
=
−
ln
|
csc
x
|
+
C
=
ln
|
sin
x
|
+
C
{\displaystyle \int \cot {x}\,dx=-\ln {\left|\csc {x}\right|}+C=\ln {\left|\sin {x}\right|}+C}
∫
sec
x
d
x
=
ln
|
sec
x
+
tan
x
|
+
C
=
ln
|
tan
(
x
2
+
π
4
)
|
+
C
{\displaystyle \int \sec {x}\,dx=\ln {\left|\sec {x}+\tan {x}\right|}+C=\ln \left|\tan \left({\dfrac {x}{2}}+{\dfrac {\pi }{4}}\right)\right|+C}
∫
csc
x
d
x
=
−
ln
|
csc
x
+
cot
x
|
+
C
=
ln
|
csc
x
−
cot
x
|
+
C
=
ln
|
tan
x
2
|
+
C
{\displaystyle \int \csc {x}\,dx=-\ln {\left|\csc {x}+\cot {x}\right|}+C=\ln {\left|\csc {x}-\cot {x}\right|}+C=\ln {\left|\tan {\frac {x}{2}}\right|}+C}
∫
sec
2
x
d
x
=
tan
x
+
C
{\displaystyle \int \sec ^{2}x\,dx=\tan x+C}
∫
csc
2
x
d
x
=
−
cot
x
+
C
{\displaystyle \int \csc ^{2}x\,dx=-\cot x+C}
∫
sec
x
tan
x
d
x
=
sec
x
+
C
{\displaystyle \int \sec {x}\,\tan {x}\,dx=\sec {x}+C}
∫
csc
x
cot
x
d
x
=
−
csc
x
+
C
{\displaystyle \int \csc {x}\,\cot {x}\,dx=-\csc {x}+C}
∫
sin
2
x
d
x
=
1
2
(
x
−
sin
2
x
2
)
+
C
=
1
2
(
x
−
sin
x
cos
x
)
+
C
{\displaystyle \int \sin ^{2}x\,dx={\frac {1}{2}}\left(x-{\frac {\sin 2x}{2}}\right)+C={\frac {1}{2}}(x-\sin x\cos x)+C}
∫
cos
2
x
d
x
=
1
2
(
x
+
sin
2
x
2
)
+
C
=
1
2
(
x
+
sin
x
cos
x
)
+
C
{\displaystyle \int \cos ^{2}x\,dx={\frac {1}{2}}\left(x+{\frac {\sin 2x}{2}}\right)+C={\frac {1}{2}}(x+\sin x\cos x)+C}
∫
tan
2
x
d
x
=
tan
x
−
x
+
C
{\displaystyle \int \tan ^{2}x\,dx=\tan x-x+C}
∫
cot
2
x
d
x
=
−
cot
x
−
x
+
C
{\displaystyle \int \cot ^{2}x\,dx=-\cot x-x+C}
∫
sec
3
x
d
x
=
1
2
(
sec
x
tan
x
+
ln
|
sec
x
+
tan
x
|
)
+
C
{\displaystyle \int \sec ^{3}x\,dx={\frac {1}{2}}(\sec x\tan x+\ln |\sec x+\tan x|)+C}
∫
csc
3
x
d
x
=
1
2
(
−
csc
x
cot
x
+
ln
|
csc
x
−
cot
x
|
)
+
C
=
1
2
(
ln
|
tan
x
2
|
−
csc
x
cot
x
)
+
C
{\displaystyle \int \csc ^{3}x\,dx={\frac {1}{2}}(-\csc x\cot x+\ln |\csc x-\cot x|)+C={\frac {1}{2}}\left(\ln \left|\tan {\frac {x}{2}}\right|-\csc x\cot x\right)+C}
∫
sin
n
x
d
x
=
−
sin
n
−
1
x
cos
x
n
+
n
−
1
n
∫
sin
n
−
2
x
d
x
{\displaystyle \int \sin ^{n}x\,dx=-{\frac {\sin ^{n-1}{x}\cos {x}}{n}}+{\frac {n-1}{n}}\int \sin ^{n-2}{x}\,dx}
∫
cos
n
x
d
x
=
cos
n
−
1
x
sin
x
n
+
n
−
1
n
∫
cos
n
−
2
x
d
x
{\displaystyle \int \cos ^{n}x\,dx={\frac {\cos ^{n-1}{x}\sin {x}}{n}}+{\frac {n-1}{n}}\int \cos ^{n-2}{x}\,dx}
Inverse trigonometric functions
∫
arcsin
x
d
x
=
x
arcsin
x
+
1
−
x
2
+
C
,
for
|
x
|
≤
1
{\displaystyle \int \arcsin {x}\,dx=x\arcsin {x}+{\sqrt {1-x^{2}}}+C,{\text{ for }}\vert x\vert \leq 1}
∫
arccos
x
d
x
=
x
arccos
x
−
1
−
x
2
+
C
,
for
|
x
|
≤
1
{\displaystyle \int \arccos {x}\,dx=x\arccos {x}-{\sqrt {1-x^{2}}}+C,{\text{ for }}\vert x\vert \leq 1}
∫
arctan
x
d
x
=
x
arctan
x
−
1
2
ln
|
1
+
x
2
|
+
C
,
for all real
x
{\displaystyle \int \arctan {x}\,dx=x\arctan {x}-{\frac {1}{2}}\ln {\vert 1+x^{2}\vert }+C,{\text{ for all real }}x}
∫
arccot
x
d
x
=
x
arccot
x
+
1
2
ln
|
1
+
x
2
|
+
C
,
for all real
x
{\displaystyle \int \operatorname {arccot} {x}\,dx=x\operatorname {arccot} {x}+{\frac {1}{2}}\ln {\vert 1+x^{2}\vert }+C,{\text{ for all real }}x}
∫
arcsec
x
d
x
=
x
arcsec
x
−
ln
|
x
(
1
+
1
−
x
−
2
)
|
+
C
,
for
|
x
|
≥
1
{\displaystyle \int \operatorname {arcsec} {x}\,dx=x\operatorname {arcsec} {x}-\ln \left\vert x\,\left(1+{\sqrt {1-x^{-2}}}\,\right)\right\vert +C,{\text{ for }}\vert x\vert \geq 1}
∫
arccsc
x
d
x
=
x
arccsc
x
+
ln
|
x
(
1
+
1
−
x
−
2
)
|
+
C
,
for
|
x
|
≥
1
{\displaystyle \int \operatorname {arccsc} {x}\,dx=x\operatorname {arccsc} {x}+\ln \left\vert x\,\left(1+{\sqrt {1-x^{-2}}}\,\right)\right\vert +C,{\text{ for }}\vert x\vert \geq 1}
Hyperbolic functions
∫
sinh
x
d
x
=
cosh
x
+
C
{\displaystyle \int \sinh x\,dx=\cosh x+C}
∫
cosh
x
d
x
=
sinh
x
+
C
{\displaystyle \int \cosh x\,dx=\sinh x+C}
∫
tanh
x
d
x
=
ln
(
cosh
x
)
+
C
{\displaystyle \int \tanh x\,dx=\ln \,(\cosh x)+C}
∫
coth
x
d
x
=
ln
|
sinh
x
|
+
C
,
for
x
≠
0
{\displaystyle \int \coth x\,dx=\ln |\sinh x|+C,{\text{ for }}x\neq 0}
∫
sech
x
d
x
=
arctan
(
sinh
x
)
+
C
{\displaystyle \int \operatorname {sech} \,x\,dx=\arctan \,(\sinh x)+C}
∫
csch
x
d
x
=
ln
|
coth
x
−
csch
x
|
+
C
=
ln
|
tanh
x
2
|
+
C
,
for
x
≠
0
{\displaystyle \int \operatorname {csch} \,x\,dx=\ln |\operatorname {coth} x-\operatorname {csch} x|+C=\ln \left|\tanh {x \over 2}\right|+C,{\text{ for }}x\neq 0}
∫
sech
2
x
d
x
=
tanh
x
+
C
{\displaystyle \int \operatorname {sech} ^{2}x\,dx=\tanh x+C}
∫
csch
2
x
d
x
=
−
coth
x
+
C
{\displaystyle \int \operatorname {csch} ^{2}x\,dx=-\operatorname {coth} x+C}
∫
sech
x
tanh
x
d
x
=
−
sech
x
+
C
{\displaystyle \int \operatorname {sech} {x}\,\operatorname {tanh} {x}\,dx=-\operatorname {sech} {x}+C}
∫
csch
x
coth
x
d
x
=
−
csch
x
+
C
{\displaystyle \int \operatorname {csch} {x}\,\operatorname {coth} {x}\,dx=-\operatorname {csch} {x}+C}
Inverse hyperbolic functions
∫
arcsinh
x
d
x
=
x
arcsinh
x
−
x
2
+
1
+
C
,
for all real
x
{\displaystyle \int \operatorname {arcsinh} \,x\,dx=x\,\operatorname {arcsinh} \,x-{\sqrt {x^{2}+1}}+C,{\text{ for all real }}x}
∫
arccosh
x
d
x
=
x
arccosh
x
−
x
2
−
1
+
C
,
for
x
≥
1
{\displaystyle \int \operatorname {arccosh} \,x\,dx=x\,\operatorname {arccosh} \,x-{\sqrt {x^{2}-1}}+C,{\text{ for }}x\geq 1}
∫
arctanh
x
d
x
=
x
arctanh
x
+
ln
(
1
−
x
2
)
2
+
C
,
for
|
x
|
<
1
{\displaystyle \int \operatorname {arctanh} \,x\,dx=x\,\operatorname {arctanh} \,x+{\frac {\ln \left(\,1-x^{2}\right)}{2}}+C,{\text{ for }}\vert x\vert <1}
∫
arccoth
x
d
x
=
x
arccoth
x
+
ln
(
x
2
−
1
)
2
+
C
,
for
|
x
|
>
1
{\displaystyle \int \operatorname {arccoth} \,x\,dx=x\,\operatorname {arccoth} \,x+{\frac {\ln \left(x^{2}-1\right)}{2}}+C,{\text{ for }}\vert x\vert >1}
∫
arcsech
x
d
x
=
x
arcsech
x
+
arcsin
x
+
C
,
for
0
<
x
≤
1
{\displaystyle \int \operatorname {arcsech} \,x\,dx=x\,\operatorname {arcsech} \,x+\arcsin x+C,{\text{ for }}0<x\leq 1}
∫
arccsch
x
d
x
=
x
arccsch
x
+
|
arcsinh
x
|
+
C
,
for
x
≠
0
{\displaystyle \int \operatorname {arccsch} \,x\,dx=x\,\operatorname {arccsch} \,x+\vert \operatorname {arcsinh} \,x\vert +C,{\text{ for }}x\neq 0}
Products of functions proportional to their second derivatives
∫
cos
a
x
e
b
x
d
x
=
e
b
x
a
2
+
b
2
(
a
sin
a
x
+
b
cos
a
x
)
+
C
{\displaystyle \int \cos ax\,e^{bx}\,dx={\frac {e^{bx}}{a^{2}+b^{2}}}\left(a\sin ax+b\cos ax\right)+C}
∫
sin
a
x
e
b
x
d
x
=
e
b
x
a
2
+
b
2
(
b
sin
a
x
−
a
cos
a
x
)
+
C
{\displaystyle \int \sin ax\,e^{bx}\,dx={\frac {e^{bx}}{a^{2}+b^{2}}}\left(b\sin ax-a\cos ax\right)+C}
∫
cos
a
x
cosh
b
x
d
x
=
1
a
2
+
b
2
(
a
sin
a
x
cosh
b
x
+
b
cos
a
x
sinh
b
x
)
+
C
{\displaystyle \int \cos ax\,\cosh bx\,dx={\frac {1}{a^{2}+b^{2}}}\left(a\sin ax\,\cosh bx+b\cos ax\,\sinh bx\right)+C}
∫
sin
a
x
cosh
b
x
d
x
=
1
a
2
+
b
2
(
b
sin
a
x
sinh
b
x
−
a
cos
a
x
cosh
b
x
)
+
C
{\displaystyle \int \sin ax\,\cosh bx\,dx={\frac {1}{a^{2}+b^{2}}}\left(b\sin ax\,\sinh bx-a\cos ax\,\cosh bx\right)+C}
Absolute-value functions
Let f be a
continuous function , that has at most one
zero . If f has a zero, let g be the unique antiderivative of f that is zero at the root of f ; otherwise, let g be any antiderivative of f . Then
∫
|
f
(
x
)
|
d
x
=
sgn
(
f
(
x
)
)
g
(
x
)
+
C
,
{\displaystyle \int \left|f(x)\right|\,dx=\operatorname {sgn}(f(x))g(x)+C,}
where
sgn(x ) is the
sign function , which takes the values −1, 0, 1 when
x is respectively negative, zero or positive.
This can be proved by computing the derivative of the right-hand side of the formula, taking into account that the condition on g is here for insuring the continuity of the integral.
This gives the following formulas (where a ≠ 0 ), which are valid over any interval where f is continuous (over larger intervals, the constant C must be replaced by a
piecewise constant function):
∫
|
(
a
x
+
b
)
n
|
d
x
=
sgn
(
a
x
+
b
)
(
a
x
+
b
)
n
+
1
a
(
n
+
1
)
+
C
{\displaystyle \int \left|(ax+b)^{n}\right|\,dx=\operatorname {sgn}(ax+b){(ax+b)^{n+1} \over a(n+1)}+C}
when n is odd, and
n
≠
−
1
{\displaystyle n\neq -1}
.
∫
|
tan
a
x
|
d
x
=
−
1
a
sgn
(
tan
a
x
)
ln
(
|
cos
a
x
|
)
+
C
{\displaystyle \int \left|\tan {ax}\right|\,dx=-{\frac {1}{a}}\operatorname {sgn}(\tan {ax})\ln(\left|\cos {ax}\right|)+C}
when
a
x
∈
(
n
π
−
π
2
,
n
π
+
π
2
)
{\textstyle ax\in \left(n\pi -{\frac {\pi }{2}},n\pi +{\frac {\pi }{2}}\right)}
for some integer n .
∫
|
csc
a
x
|
d
x
=
−
1
a
sgn
(
csc
a
x
)
ln
(
|
csc
a
x
+
cot
a
x
|
)
+
C
{\displaystyle \int \left|\csc {ax}\right|\,dx=-{\frac {1}{a}}\operatorname {sgn}(\csc {ax})\ln(\left|\csc {ax}+\cot {ax}\right|)+C}
when
a
x
∈
(
n
π
,
n
π
+
π
)
{\displaystyle ax\in \left(n\pi ,n\pi +\pi \right)}
for some integer n .
∫
|
sec
a
x
|
d
x
=
1
a
sgn
(
sec
a
x
)
ln
(
|
sec
a
x
+
tan
a
x
|
)
+
C
{\displaystyle \int \left|\sec {ax}\right|\,dx={\frac {1}{a}}\operatorname {sgn}(\sec {ax})\ln(\left|\sec {ax}+\tan {ax}\right|)+C}
when
a
x
∈
(
n
π
−
π
2
,
n
π
+
π
2
)
{\textstyle ax\in \left(n\pi -{\frac {\pi }{2}},n\pi +{\frac {\pi }{2}}\right)}
for some integer n .
∫
|
cot
a
x
|
d
x
=
1
a
sgn
(
cot
a
x
)
ln
(
|
sin
a
x
|
)
+
C
{\displaystyle \int \left|\cot {ax}\right|\,dx={\frac {1}{a}}\operatorname {sgn}(\cot {ax})\ln(\left|\sin {ax}\right|)+C}
when
a
x
∈
(
n
π
,
n
π
+
π
)
{\displaystyle ax\in \left(n\pi ,n\pi +\pi \right)}
for some integer n .
If the function f does not have any continuous antiderivative which takes the value zero at the zeros of f (this is the case for the sine and the cosine functions), then sgn(f (x )) ∫ f (x ) dx is an antiderivative of f on every
interval on which f is not zero, but may be discontinuous at the points where f (x ) = 0 . For having a continuous antiderivative, one has thus to add a well chosen
step function . If we also use the fact that the absolute values of sine and cosine are periodic with period π , then we get:
∫
|
sin
a
x
|
d
x
=
2
a
⌊
a
x
π
⌋
−
1
a
cos
(
a
x
−
⌊
a
x
π
⌋
π
)
+
C
{\displaystyle \int \left|\sin {ax}\right|\,dx={2 \over a}\left\lfloor {\frac {ax}{\pi }}\right\rfloor -{1 \over a}\cos {\left(ax-\left\lfloor {\frac {ax}{\pi }}\right\rfloor \pi \right)}+C}
[
citation needed ]
∫
|
cos
a
x
|
d
x
=
2
a
⌊
a
x
π
+
1
2
⌋
+
1
a
sin
(
a
x
−
⌊
a
x
π
+
1
2
⌋
π
)
+
C
{\displaystyle \int \left|\cos {ax}\right|\,dx={2 \over a}\left\lfloor {\frac {ax}{\pi }}+{\frac {1}{2}}\right\rfloor +{1 \over a}\sin {\left(ax-\left\lfloor {\frac {ax}{\pi }}+{\frac {1}{2}}\right\rfloor \pi \right)}+C}
[
citation needed ]
Special functions
Ci , Si :
Trigonometric integrals , Ei :
Exponential integral , li :
Logarithmic integral function , erf :
Error function
∫
Ci
(
x
)
d
x
=
x
Ci
(
x
)
−
sin
x
{\displaystyle \int \operatorname {Ci} (x)\,dx=x\operatorname {Ci} (x)-\sin x}
∫
Si
(
x
)
d
x
=
x
Si
(
x
)
+
cos
x
{\displaystyle \int \operatorname {Si} (x)\,dx=x\operatorname {Si} (x)+\cos x}
∫
Ei
(
x
)
d
x
=
x
Ei
(
x
)
−
e
x
{\displaystyle \int \operatorname {Ei} (x)\,dx=x\operatorname {Ei} (x)-e^{x}}
∫
li
(
x
)
d
x
=
x
li
(
x
)
−
Ei
(
2
ln
x
)
{\displaystyle \int \operatorname {li} (x)\,dx=x\operatorname {li} (x)-\operatorname {Ei} (2\ln x)}
∫
li
(
x
)
x
d
x
=
ln
x
li
(
x
)
−
x
{\displaystyle \int {\frac {\operatorname {li} (x)}{x}}\,dx=\ln x\,\operatorname {li} (x)-x}
∫
erf
(
x
)
d
x
=
e
−
x
2
π
+
x
erf
(
x
)
{\displaystyle \int \operatorname {erf} (x)\,dx={\frac {e^{-x^{2}}}{\sqrt {\pi }}}+x\operatorname {erf} (x)}
Definite integrals lacking closed-form antiderivatives
There are some functions whose antiderivatives cannot be expressed in
closed form . However, the values of the definite integrals of some of these functions over some common intervals can be calculated. A few useful integrals are given below.
∫
0
∞
x
e
−
x
d
x
=
1
2
π
{\displaystyle \int _{0}^{\infty }{\sqrt {x}}\,e^{-x}\,dx={\frac {1}{2}}{\sqrt {\pi }}}
(see also
Gamma function )
∫
0
∞
e
−
a
x
2
d
x
=
1
2
π
a
{\displaystyle \int _{0}^{\infty }e^{-ax^{2}}\,dx={\frac {1}{2}}{\sqrt {\frac {\pi }{a}}}}
for a > 0 (the
Gaussian integral )
∫
0
∞
x
2
e
−
a
x
2
d
x
=
1
4
π
a
3
{\displaystyle \int _{0}^{\infty }{x^{2}e^{-ax^{2}}\,dx}={\frac {1}{4}}{\sqrt {\frac {\pi }{a^{3}}}}}
for a > 0
∫
0
∞
x
2
n
e
−
a
x
2
d
x
=
2
n
−
1
2
a
∫
0
∞
x
2
(
n
−
1
)
e
−
a
x
2
d
x
=
(
2
n
−
1
)
!
!
2
n
+
1
π
a
2
n
+
1
=
(
2
n
)
!
n
!
2
2
n
+
1
π
a
2
n
+
1
{\displaystyle \int _{0}^{\infty }x^{2n}e^{-ax^{2}}\,dx={\frac {2n-1}{2a}}\int _{0}^{\infty }x^{2(n-1)}e^{-ax^{2}}\,dx={\frac {(2n-1)!!}{2^{n+1}}}{\sqrt {\frac {\pi }{a^{2n+1}}}}={\frac {(2n)!}{n!2^{2n+1}}}{\sqrt {\frac {\pi }{a^{2n+1}}}}}
for a > 0 , n is a positive integer and !! is the
double factorial .
∫
0
∞
x
3
e
−
a
x
2
d
x
=
1
2
a
2
{\displaystyle \int _{0}^{\infty }{x^{3}e^{-ax^{2}}\,dx}={\frac {1}{2a^{2}}}}
when a > 0
∫
0
∞
x
2
n
+
1
e
−
a
x
2
d
x
=
n
a
∫
0
∞
x
2
n
−
1
e
−
a
x
2
d
x
=
n
!
2
a
n
+
1
{\displaystyle \int _{0}^{\infty }x^{2n+1}e^{-ax^{2}}\,dx={\frac {n}{a}}\int _{0}^{\infty }x^{2n-1}e^{-ax^{2}}\,dx={\frac {n!}{2a^{n+1}}}}
for a > 0 , n = 0, 1, 2, ....
∫
0
∞
x
e
x
−
1
d
x
=
π
2
6
{\displaystyle \int _{0}^{\infty }{\frac {x}{e^{x}-1}}\,dx={\frac {\pi ^{2}}{6}}}
(see also
Bernoulli number )
∫
0
∞
x
2
e
x
−
1
d
x
=
2
ζ
(
3
)
≈
2.40
{\displaystyle \int _{0}^{\infty }{\frac {x^{2}}{e^{x}-1}}\,dx=2\zeta (3)\approx 2.40}
∫
0
∞
x
3
e
x
−
1
d
x
=
π
4
15
{\displaystyle \int _{0}^{\infty }{\frac {x^{3}}{e^{x}-1}}\,dx={\frac {\pi ^{4}}{15}}}
∫
0
∞
sin
x
x
d
x
=
π
2
{\displaystyle \int _{0}^{\infty }{\frac {\sin {x}}{x}}\,dx={\frac {\pi }{2}}}
(see
sinc function and the
Dirichlet integral )
∫
0
∞
sin
2
x
x
2
d
x
=
π
2
{\displaystyle \int _{0}^{\infty }{\frac {\sin ^{2}{x}}{x^{2}}}\,dx={\frac {\pi }{2}}}
∫
0
π
2
sin
n
x
d
x
=
∫
0
π
2
cos
n
x
d
x
=
(
n
−
1
)
!
!
n
!
!
×
{
1
if
n
is odd
π
2
if
n
is even.
{\displaystyle \int _{0}^{\frac {\pi }{2}}\sin ^{n}x\,dx=\int _{0}^{\frac {\pi }{2}}\cos ^{n}x\,dx={\frac {(n-1)!!}{n!!}}\times {\begin{cases}1&{\text{if }}n{\text{ is odd}}\\{\frac {\pi }{2}}&{\text{if }}n{\text{ is even.}}\end{cases}}}
(if n is a positive integer and !! is the
double factorial ).
∫
−
π
π
cos
(
α
x
)
cos
n
(
β
x
)
d
x
=
{
2
π
2
n
(
n
m
)
|
α
|
=
|
β
(
2
m
−
n
)
|
0
otherwise
{\displaystyle \int _{-\pi }^{\pi }\cos(\alpha x)\cos ^{n}(\beta x)dx={\begin{cases}{\frac {2\pi }{2^{n}}}{\binom {n}{m}}&|\alpha |=|\beta (2m-n)|\\0&{\text{otherwise}}\end{cases}}}
(for α , β , m , n integers with β ≠ 0 and m , n ≥ 0 , see also
Binomial coefficient )
∫
−
t
t
sin
m
(
α
x
)
cos
n
(
β
x
)
d
x
=
0
{\displaystyle \int _{-t}^{t}\sin ^{m}(\alpha x)\cos ^{n}(\beta x)dx=0}
(for α , β real, n a non-negative integer, and m an odd, positive integer; since the integrand is
odd )
∫
−
π
π
sin
(
α
x
)
sin
n
(
β
x
)
d
x
=
{
(
−
1
)
(
n
+
1
2
)
(
−
1
)
m
2
π
2
n
(
n
m
)
n
odd
,
α
=
β
(
2
m
−
n
)
0
otherwise
{\displaystyle \int _{-\pi }^{\pi }\sin(\alpha x)\sin ^{n}(\beta x)dx={\begin{cases}(-1)^{\left({\frac {n+1}{2}}\right)}(-1)^{m}{\frac {2\pi }{2^{n}}}{\binom {n}{m}}&n{\text{ odd}},\ \alpha =\beta (2m-n)\\0&{\text{otherwise}}\end{cases}}}
(for α , β , m , n integers with β ≠ 0 and m , n ≥ 0 , see also
Binomial coefficient )
∫
−
π
π
cos
(
α
x
)
sin
n
(
β
x
)
d
x
=
{
(
−
1
)
(
n
2
)
(
−
1
)
m
2
π
2
n
(
n
m
)
n
even
,
|
α
|
=
|
β
(
2
m
−
n
)
|
0
otherwise
{\displaystyle \int _{-\pi }^{\pi }\cos(\alpha x)\sin ^{n}(\beta x)dx={\begin{cases}(-1)^{\left({\frac {n}{2}}\right)}(-1)^{m}{\frac {2\pi }{2^{n}}}{\binom {n}{m}}&n{\text{ even}},\ |\alpha |=|\beta (2m-n)|\\0&{\text{otherwise}}\end{cases}}}
(for α , β , m , n integers with β ≠ 0 and m , n ≥ 0 , see also
Binomial coefficient )
∫
−
∞
∞
e
−
(
a
x
2
+
b
x
+
c
)
d
x
=
π
a
exp
b
2
−
4
a
c
4
a
{\displaystyle \int _{-\infty }^{\infty }e^{-(ax^{2}+bx+c)}\,dx={\sqrt {\frac {\pi }{a}}}\exp \left[{\frac {b^{2}-4ac}{4a}}\right]}
(where exp[u is the
exponential function e u , and a > 0 .)
∫
0
∞
x
z
−
1
e
−
x
d
x
=
Γ
(
z
)
{\displaystyle \int _{0}^{\infty }x^{z-1}\,e^{-x}\,dx=\Gamma (z)}
(where
Γ
(
z
)
{\displaystyle \Gamma (z)}
is the
Gamma function )
∫
0
1
(
ln
1
x
)
p
d
x
=
Γ
(
p
+
1
)
{\displaystyle \int _{0}^{1}\left(\ln {\frac {1}{x}}\right)^{p}\,dx=\Gamma (p+1)}
∫
0
1
x
α
−
1
(
1
−
x
)
β
−
1
d
x
=
Γ
(
α
)
Γ
(
β
)
Γ
(
α
+
β
)
{\displaystyle \int _{0}^{1}x^{\alpha -1}(1-x)^{\beta -1}dx={\frac {\Gamma (\alpha )\Gamma (\beta )}{\Gamma (\alpha +\beta )}}}
(for Re(α ) > 0 and Re(β ) > 0 , see
Beta function )
∫
0
2
π
e
x
cos
θ
d
θ
=
2
π
I
0
(
x
)
{\displaystyle \int _{0}^{2\pi }e^{x\cos \theta }d\theta =2\pi I_{0}(x)}
(where I 0 (x ) is the modified
Bessel function of the first kind)
∫
0
2
π
e
x
cos
θ
+
y
sin
θ
d
θ
=
2
π
I
0
(
x
2
+
y
2
)
{\displaystyle \int _{0}^{2\pi }e^{x\cos \theta +y\sin \theta }d\theta =2\pi I_{0}\left({\sqrt {x^{2}+y^{2}}}\right)}
∫
−
∞
∞
(
1
+
x
2
ν
)
−
ν
+
1
2
d
x
=
ν
π
Γ
(
ν
2
)
Γ
(
ν
+
1
2
)
{\displaystyle \int _{-\infty }^{\infty }\left(1+{\frac {x^{2}}{\nu }}\right)^{-{\frac {\nu +1}{2}}}\,dx={\frac {{\sqrt {\nu \pi }}\ \Gamma \left({\frac {\nu }{2}}\right)}{\Gamma \left({\frac {\nu +1}{2}}\right)}}}
(for ν > 0 , this is related to the
probability density function of
Student's t -distribution )
If the function f has
bounded variation on the interval [a ,b ] , then the
method of exhaustion provides a formula for the integral:
∫
a
b
f
(
x
)
d
x
=
(
b
−
a
)
∑
n
=
1
∞
∑
m
=
1
2
n
−
1
(
−
1
)
m
+
1
2
−
n
f
(
a
+
m
(
b
−
a
)
2
−
n
)
.
{\displaystyle \int _{a}^{b}{f(x)\,dx}=(b-a)\sum \limits _{n=1}^{\infty }{\sum \limits _{m=1}^{2^{n}-1}{\left({-1}\right)^{m+1}}}2^{-n}f(a+m\left({b-a}\right)2^{-n}).}
The "
sophomore's dream ":
∫
0
1
x
−
x
d
x
=
∑
n
=
1
∞
n
−
n
(
=
1.29128
59970
6266
…
)
∫
0
1
x
x
d
x
=
−
∑
n
=
1
∞
(
−
n
)
−
n
(
=
0.78343
05107
1213
…
)
{\displaystyle {\begin{aligned}\int _{0}^{1}x^{-x}\,dx&=\sum _{n=1}^{\infty }n^{-n}&&(=1.29128\,59970\,6266\dots )\\[6pt]\int _{0}^{1}x^{x}\,dx&=-\sum _{n=1}^{\infty }(-n)^{-n}&&(=0.78343\,05107\,1213\dots )\end{aligned}}}
attributed to
Johann Bernoulli .
See also
References
Further reading
Abramowitz, Milton ;
Stegun, Irene Ann , eds. (1983) [June 1964].
Handbook of Mathematical Functions with Formulas, Graphs, and Mathematical Tables . Applied Mathematics Series. Vol. 55 (Ninth reprint with additional corrections of tenth original printing with corrections (December 1972); first ed.). Washington D.C.; New York: United States Department of Commerce, National Bureau of Standards; Dover Publications.
ISBN
978-0-486-61272-0 .
LCCN
64-60036 .
MR
0167642 .
LCCN
65-12253 .
Bronstein, Ilja Nikolaevič; Semendjajew, Konstantin Adolfovič (1987) [1945]. Grosche, Günter; Ziegler, Viktor; Ziegler, Dorothea (eds.).
Taschenbuch der Mathematik (in German). Vol. 1. Translated by Ziegler, Viktor. Weiß, Jürgen (23 ed.). Thun and Frankfurt am Main:
Verlag Harri Deutsch (and
B. G. Teubner Verlagsgesellschaft , Leipzig).
ISBN
3-87144-492-8 .
Gradshteyn, Izrail Solomonovich ;
Ryzhik, Iosif Moiseevich ;
Geronimus, Yuri Veniaminovich ;
Tseytlin, Michail Yulyevich ; Jeffrey, Alan (2015) [October 2014]. Zwillinger, Daniel; Moll, Victor Hugo (eds.).
Table of Integrals, Series, and Products . Translated by Scripta Technica, Inc. (8 ed.).
Academic Press, Inc.
ISBN
978-0-12-384933-5 .
LCCN
2014010276 . (Several previous editions as well.)
Prudnikov, Anatolii Platonovich (Прудников, Анатолий Платонович) ; Brychkov, Yuri A. (Брычков, Ю. А.);
Marichev, Oleg Igorevich (Маричев, Олег Игоревич) (1988–1992) [1981−1986 (Russian)].
Integrals and Series . Vol. 1–5. Translated by Queen, N. M. (1 ed.). (
Nauka ) Gordon & Breach Science Publishers/
CRC Press .
ISBN
2-88124-097-6 . . Second revised edition (Russian), volume 1–3, Fiziko-Matematicheskaya Literatura, 2003.
Yuri A. Brychkov (Ю. А. Брычков), Handbook of Special Functions: Derivatives, Integrals, Series and Other Formulas . Russian edition, Fiziko-Matematicheskaya Literatura, 2006. English edition, Chapman & Hall/CRC Press, 2008,
ISBN
1-58488-956-X / 9781584889564.
Daniel Zwillinger. CRC Standard Mathematical Tables and Formulae , 31st edition. Chapman & Hall/CRC Press, 2002.
ISBN
1-58488-291-3 . (Many earlier editions as well.)
Meyer Hirsch [
de ] ,
Integraltafeln oder Sammlung von Integralformeln (Duncker und Humblot, Berlin, 1810)
Meyer Hirsch [
de ] ,
Integral Tables Or A Collection of Integral Formulae (Baynes and son, London, 1823) [English translation of Integraltafeln
David Bierens de Haan ,
Nouvelles Tables d'Intégrales définies (Engels, Leiden, 1862)
Benjamin O. Pierce
A short table of integrals - revised edition (Ginn & co., Boston, 1899)
External links
Tables of integrals
Derivations
Online service
Open source programs
Videos