不定积分的典型例题
1 t21
222
dx 1 t22t1 t2 (1 t2)(1 t)1
1 t21 t2 1t 1
( )dt
t 1t2 1
1
lnt 1 ln(t2 1) arctant c
2
1x ln(1 sinx) c.
22
*例6 x2x2 1dx 1422 x xdx2
112121112222
(x ) ()d(x ) u ()du 222222
分部积分
1111
uu2 ()2 ln(u u2 ()2) c4216211
x(2x2 1)x2 1 lnx x2 1 c.88
(x 1)2
22
x (x 2x x2)dx分项
3
1
1
例7
45
2x x x c.
32
3
252
例8.
1111 [ 1 x42 1 x21 x2]dx
11 x1 ln arctanx c. 41 x2
例9.
x1 x 1 dx x x
124
dx x x x c.
33 x
xdx
例10.