oo / | | 1 | ------------- dx | 2 | x + 4*x + 11 | / -oo
Integral(1/(x^2 + 4*x + 11), (x, -oo, oo))
/ | | 1 | ------------- dx | 2 | x + 4*x + 11 | /
1 1 ------------- = ------------------------------ 2 / 2 \ x + 4*x + 11 |/ ___ ___\ | ||-\/ 7 2*\/ 7 | | 7*||-------*x - -------| + 1| \\ 7 7 / /
/ | | 1 | ------------- dx | 2 = | x + 4*x + 11 | /
/ | | 1 | -------------------------- dx | 2 | / ___ ___\ | |-\/ 7 2*\/ 7 | | |-------*x - -------| + 1 | \ 7 7 / | / -------------------------------- 7
/ | | 1 | -------------------------- dx | 2 | / ___ ___\ | |-\/ 7 2*\/ 7 | | |-------*x - -------| + 1 | \ 7 7 / | / -------------------------------- 7
___ ___ 2*\/ 7 x*\/ 7 v = - ------- - ------- 7 7
/ | | 1 | ------ dv | 2 | 1 + v | / atan(v) ------------ = ------- 7 7
/ | | 1 | -------------------------- dx | 2 | / ___ ___\ | |-\/ 7 2*\/ 7 | | |-------*x - -------| + 1 / ___ ___\ | \ 7 7 / ___ |2*\/ 7 x*\/ 7 | | \/ 7 *atan|------- + -------| / \ 7 7 / -------------------------------- = ----------------------------- 7 7
/ ___ ___\ ___ |2*\/ 7 x*\/ 7 | \/ 7 *atan|------- + -------| \ 7 7 / C + ----------------------------- 7
/ ___ \ / ___ |\/ 7 *(2 + x)| | \/ 7 *atan|-------------| | 1 \ 7 / | ------------- dx = C + ------------------------- | 2 7 | x + 4*x + 11 | /
___ pi*\/ 7 -------- 7
=
___ pi*\/ 7 -------- 7
pi*sqrt(7)/7
Estos ejemplos se pueden aplicar para introducción de los límites de integración inferior y superior.