oo / | | 1 | ------------ dx | 2 | x - 2*x + 4 | / 1
Integral(1/(x^2 - 2*x + 4), (x, 1, oo))
/ | | 1 | ------------ dx | 2 | x - 2*x + 4 | /
1 1 ------------ = ---------------------------- 2 / 2 \ x - 2*x + 4 |/ ___ ___\ | ||-\/ 3 \/ 3 | | 3*||-------*x + -----| + 1| \\ 3 3 / /
/ | | 1 | ------------ dx | 2 = | x - 2*x + 4 | /
/ | | 1 | ------------------------ dx | 2 | / ___ ___\ | |-\/ 3 \/ 3 | | |-------*x + -----| + 1 | \ 3 3 / | / ------------------------------ 3
/ | | 1 | ------------------------ dx | 2 | / ___ ___\ | |-\/ 3 \/ 3 | | |-------*x + -----| + 1 | \ 3 3 / | / ------------------------------ 3
___ ___ \/ 3 x*\/ 3 v = ----- - ------- 3 3
/ | | 1 | ------ dv | 2 | 1 + v | / atan(v) ------------ = ------- 3 3
/ | | 1 | ------------------------ dx | 2 | / ___ ___\ | |-\/ 3 \/ 3 | | |-------*x + -----| + 1 / ___ ___\ | \ 3 3 / ___ | \/ 3 x*\/ 3 | | \/ 3 *atan|- ----- + -------| / \ 3 3 / ------------------------------ = ----------------------------- 3 3
/ ___ ___\ ___ | \/ 3 x*\/ 3 | \/ 3 *atan|- ----- + -------| \ 3 3 / C + ----------------------------- 3
/ ___ \ / ___ |\/ 3 *(-1 + x)| | \/ 3 *atan|--------------| | 1 \ 3 / | ------------ dx = C + -------------------------- | 2 3 | x - 2*x + 4 | /
___ pi*\/ 3 -------- 6
=
___ pi*\/ 3 -------- 6
pi*sqrt(3)/6
Estos ejemplos se pueden aplicar para introducción de los límites de integración inferior y superior.