1 / | | x | -------------- dx | 2 | x + 12*x + 45 | / 0
Integral(x/(x^2 + 12*x + 45), (x, 0, 1))
/ | | x | -------------- dx | 2 | x + 12*x + 45 | /
/ 2*x + 12 \ |--------------| /-6 \ | 2 | |---| x \x + 12*x + 45/ \ 9 / -------------- = ---------------- + -------------- 2 2 2 x + 12*x + 45 / x \ |- - - 2| + 1 \ 3 /
/ | | x | -------------- dx | 2 = | x + 12*x + 45 | /
/ | / | 1 | 2* | -------------- dx | 2*x + 12 | 2 | -------------- dx | / x \ | 2 | |- - - 2| + 1 | x + 12*x + 45 | \ 3 / | | / / -------------------- - ---------------------- 2 3
/ | | 2*x + 12 | -------------- dx | 2 | x + 12*x + 45 | / -------------------- 2
2 u = x + 12*x
/ | | 1 | ------ du | 45 + u | / log(45 + u) ------------ = ----------- 2 2
/ | | 2*x + 12 | -------------- dx | 2 | x + 12*x + 45 | / 2 \ / log\45 + x + 12*x/ -------------------- = ------------------- 2 2
/ | | 1 -2* | -------------- dx | 2 | / x \ | |- - - 2| + 1 | \ 3 / | / ----------------------- 3
x v = -2 - - 3
/ | | 1 -2* | ------ dv | 2 | 1 + v | / -2*atan(v) --------------- = ---------- 3 3
/ | | 1 -2* | -------------- dx | 2 | / x \ | |- - - 2| + 1 | \ 3 / | / / x\ ----------------------- = -2*atan|2 + -| 3 \ 3/
/ 2 \ log\45 + x + 12*x/ / x\ C + ------------------- - 2*atan|2 + -| 2 \ 3/
/ | / 2 \ | x log\45 + x + 12*x/ / x\ | -------------- dx = C + ------------------- - 2*atan|2 + -| | 2 2 \ 3/ | x + 12*x + 45 | /
log(58) log(45) ------- - 2*atan(7/3) + 2*atan(2) - ------- 2 2
=
log(58) log(45) ------- - 2*atan(7/3) + 2*atan(2) - ------- 2 2
log(58)/2 - 2*atan(7/3) + 2*atan(2) - log(45)/2
Estos ejemplos se pueden aplicar para introducción de los límites de integración inferior y superior.