4 / | | ____ | \/ 20 | ------- dx | 2 | 16 + x | / 0
Integral(sqrt(20)/(16 + x^2), (x, 0, 4))
/ | | ____ | \/ 20 | ------- dx | 2 | 16 + x | /
/ ___\ |2*\/ 5 | ____ |-------| \/ 20 \ 16 / ------- = ---------- 2 2 16 + x /-x \ |---| + 1 \ 4 /
/ | | ____ | \/ 20 | ------- dx = | 2 | 16 + x | /
/ | ___ | 1 \/ 5 * | ---------- dx | 2 | /-x \ | |---| + 1 | \ 4 / | / ---------------------- 8
/ | ___ | 1 \/ 5 * | ---------- dx | 2 | /-x \ | |---| + 1 | \ 4 / | / ---------------------- 8
-x v = --- 4
/ | ___ | 1 \/ 5 * | ------ dv | 2 | 1 + v | ___ / \/ 5 *atan(v) ------------------ = ------------- 8 8
/ | ___ | 1 \/ 5 * | ---------- dx | 2 | /-x \ | |---| + 1 | \ 4 / ___ /x\ | \/ 5 *atan|-| / \4/ ---------------------- = ------------- 8 2
___ /x\ \/ 5 *atan|-| \4/ C + ------------- 2
/ | ___ /x\ | ____ \/ 5 *atan|-| | \/ 20 \4/ | ------- dx = C + ------------- | 2 2 | 16 + x | /
___ pi*\/ 5 -------- 8
=
___ pi*\/ 5 -------- 8
pi*sqrt(5)/8
Estos ejemplos se pueden aplicar para introducción de los límites de integración inferior y superior.