1 / | | 1 | ------------ du | 2 | u + 2*u + 4 | / 0
Integral(1/(u^2 + 2*u + 4), (u, 0, 1))
/ | | 1 | ------------ du | 2 | u + 2*u + 4 | /
1 1 ------------ = ---------------------------- 2 / 2 \ u + 2*u + 4 |/ ___ ___\ | ||-\/ 3 \/ 3 | | 3*||-------*u - -----| + 1| \\ 3 3 / /
/ | | 1 | ------------ du | 2 = | u + 2*u + 4 | /
/ | | 1 | ------------------------ du | 2 | / ___ ___\ | |-\/ 3 \/ 3 | | |-------*u - -----| + 1 | \ 3 3 / | / ------------------------------ 3
/ | | 1 | ------------------------ du | 2 | / ___ ___\ | |-\/ 3 \/ 3 | | |-------*u - -----| + 1 | \ 3 3 / | / ------------------------------ 3
___ ___ \/ 3 u*\/ 3 v = - ----- - ------- 3 3
/ | | 1 | ------ dv | 2 | 1 + v | / atan(v) ------------ = ------- 3 3
/ | | 1 | ------------------------ du | 2 | / ___ ___\ | |-\/ 3 \/ 3 | | |-------*u - -----| + 1 / ___ ___\ | \ 3 3 / ___ |\/ 3 u*\/ 3 | | \/ 3 *atan|----- + -------| / \ 3 3 / ------------------------------ = --------------------------- 3 3
/ ___ ___\ ___ |\/ 3 u*\/ 3 | \/ 3 *atan|----- + -------| \ 3 3 / C + --------------------------- 3
/ ___ \ / ___ |\/ 3 *(1 + u)| | \/ 3 *atan|-------------| | 1 \ 3 / | ------------ du = C + ------------------------- | 2 3 | u + 2*u + 4 | /
/ ___\ ___ |2*\/ 3 | ___ \/ 3 *atan|-------| pi*\/ 3 \ 3 / - -------- + ------------------- 18 3
=
/ ___\ ___ |2*\/ 3 | ___ \/ 3 *atan|-------| pi*\/ 3 \ 3 / - -------- + ------------------- 18 3
-pi*sqrt(3)/18 + sqrt(3)*atan(2*sqrt(3)/3)/3
Estos ejemplos se pueden aplicar para introducción de los límites de integración inferior y superior.