1 / | | x | ------------ dx | 2 | x + 4*x + 8 | / 0
/ | | x | 1*------------ dx | 2 | x + 4*x + 8 | /
/ 1*2*x + 4 \ |--------------| /-2 \ | 2 | |---| x \1*x + 4*x + 8/ \ 4 / ------------ = ---------------- + -------------- 2 2 2 x + 4*x + 8 / x \ |- - - 1| + 1 \ 2 /
/ | | x | 1*------------ dx | 2 = | x + 4*x + 8 | /
/ | / | 1 | | -------------- dx | 1*2*x + 4 | 2 | -------------- dx | / x \ | 2 | |- - - 1| + 1 | 1*x + 4*x + 8 | \ 2 / | | / / -------------------- - -------------------- 2 2
/ | | 1*2*x + 4 | -------------- dx | 2 | 1*x + 4*x + 8 | / -------------------- 2
2 u = x + 4*x
/ | | 1 | ----- du | 8 + u | / log(8 + u) ----------- = ---------- 2 2
/ | | 1*2*x + 4 | -------------- dx | 2 | 1*x + 4*x + 8 | / 2 \ / log\8 + x + 4*x/ -------------------- = ----------------- 2 2
/ | | 1 - | -------------- dx | 2 | / x \ | |- - - 1| + 1 | \ 2 / | / ---------------------- 2
x v = -1 - - 2
/ | | 1 - | ------ dv | 2 | 1 + v | / -atan(v) -------------- = --------- 2 2
/ | | 1 - | -------------- dx | 2 | / x \ | |- - - 1| + 1 | \ 2 / | / / x\ ---------------------- = -atan|1 + -| 2 \ 2/
/ 2 \ log\8 + x + 4*x/ / x\ C + ----------------- - atan|1 + -| 2 \ 2/
/ | / 2 \ | x log\8 + x + 4*x/ / x\ | ------------ dx = C + ----------------- - atan|1 + -| | 2 2 \ 2/ | x + 4*x + 8 | /
log(13) log(8) pi ------- - atan(3/2) - ------ + -- 2 2 4
=
log(13) log(8) pi ------- - atan(3/2) - ------ + -- 2 2 4
Данные примеры также можно применять при вводе верхнего и нижнего предела интегрирования.