1 / | | 3*x + 1 | ------------ dx | 2 | x + 4*x + 5 | / 0
Integral((3*x + 1)/(x^2 + 4*x + 5), (x, 0, 1))
/ | | 3*x + 1 | ------------ dx | 2 | x + 4*x + 5 | /
2*x + 4 3*------------ /-5 \ 2 |---| 3*x + 1 x + 4*x + 5 \ 1 / ------------ = -------------- + ------------- 2 2 2 x + 4*x + 5 (-x - 2) + 1
/ | | 3*x + 1 | ------------ dx | 2 = | x + 4*x + 5 | /
/ | | 2*x + 4 3* | ------------ dx | 2 / | x + 4*x + 5 | | | 1 / - 5* | ------------- dx + -------------------- | 2 2 | (-x - 2) + 1 | /
/ | | 2*x + 4 3* | ------------ dx | 2 | x + 4*x + 5 | / -------------------- 2
2 u = x + 4*x
/ | | 1 3* | ----- du | 5 + u | / 3*log(5 + u) ------------- = ------------ 2 2
/ | | 2*x + 4 3* | ------------ dx | 2 | x + 4*x + 5 | / 2 \ / 3*log\5 + x + 4*x/ -------------------- = ------------------- 2 2
/ | | 1 -5* | ------------- dx | 2 | (-x - 2) + 1 | /
v = -2 - x
/ | | 1 -5* | ------ dv = -5*atan(v) | 2 | 1 + v | /
/ | | 1 -5* | ------------- dx = -5*atan(2 + x) | 2 | (-x - 2) + 1 | /
/ 2 \ 3*log\5 + x + 4*x/ C - 5*atan(2 + x) + ------------------- 2
/ | / 2 \ | 3*x + 1 3*log\5 + x + 4*x/ | ------------ dx = C - 5*atan(2 + x) + ------------------- | 2 2 | x + 4*x + 5 | /
3*log(5) 3*log(10) -5*atan(3) + 5*atan(2) - -------- + --------- 2 2
=
3*log(5) 3*log(10) -5*atan(3) + 5*atan(2) - -------- + --------- 2 2
-5*atan(3) + 5*atan(2) - 3*log(5)/2 + 3*log(10)/2
Estos ejemplos se pueden aplicar para introducción de los límites de integración inferior y superior.