1 / | | x | ------------- dx | 2 | x + 4*x + 13 | / 0
/ | | x | 1*------------- dx | 2 | x + 4*x + 13 | /
/ 1*2*x + 4 \ |---------------| /-2 \ | 2 | |---| x \1*x + 4*x + 13/ \ 9 / ------------- = ----------------- + -------------- 2 2 2 x + 4*x + 13 / x 2\ |- - - -| + 1 \ 3 3/
/ | | x | 1*------------- dx | 2 = | x + 4*x + 13 | /
/ | / | 1 | 2* | -------------- dx | 1*2*x + 4 | 2 | --------------- dx | / x 2\ | 2 | |- - - -| + 1 | 1*x + 4*x + 13 | \ 3 3/ | | / / --------------------- - ---------------------- 2 9
/ | | 1*2*x + 4 | --------------- dx | 2 | 1*x + 4*x + 13 | / --------------------- 2
2 u = x + 4*x
/ | | 1 | ------ du | 13 + u | / log(13 + u) ------------ = ----------- 2 2
/ | | 1*2*x + 4 | --------------- dx | 2 | 1*x + 4*x + 13 | / 2 \ / log\13 + x + 4*x/ --------------------- = ------------------ 2 2
/ | | 1 -2* | -------------- dx | 2 | / x 2\ | |- - - -| + 1 | \ 3 3/ | / ----------------------- 9
2 x v = - - - - 3 3
/ | | 1 -2* | ------ dv | 2 | 1 + v | / -2*atan(v) --------------- = ---------- 9 9
/ | | 1 -2* | -------------- dx | 2 | / x 2\ | |- - - -| + 1 | \ 3 3/ /2 x\ | -2*atan|- + -| / \3 3/ ----------------------- = -------------- 9 3
/2 x\ / 2 \ 2*atan|- + -| log\13 + x + 4*x/ \3 3/ C + ------------------ - ------------- 2 3
/ /2 x\ | / 2 \ 2*atan|- + -| | x log\13 + x + 4*x/ \3 3/ | ------------- dx = C + ------------------ - ------------- | 2 2 3 | x + 4*x + 13 | /
log(18) log(13) pi 2*atan(2/3) ------- - ------- - -- + ----------- 2 2 6 3
=
log(18) log(13) pi 2*atan(2/3) ------- - ------- - -- + ----------- 2 2 6 3
Данные примеры также можно применять при вводе верхнего и нижнего предела интегрирования.