.
.
int cos ln xdx.20. $\int \cos \ln xdx$.
-tan xdx-|||-c.tan xdx-|||-D. -tan x +
(18)int x^2arctan xdx.(18)$\int x^{2}\arctan xdx$.
计算(int )_(0)^1xarctan xdx.计算.
int (tan )^4xdx; ;
[题目]计算定积分: (int )_(0)^1xarctan xdx.
5.设 _(1)=(int )_(0)^1xdx , _(2)=(int )_(0)^1sin xdx , _(3)=(int )_(0)^1tan xdx,
15) int tan^10xcdotsec^2xdx;15) $\int \tan^{10}x\cdot\sec^{2}xdx;$
(5) int (tan )^10xcdot (sec )^2xdx;
[题目]计算定积分: (int )_(-dfrac {pi )(2)}^dfrac (pi {2)}dfrac (1)(2)xcos xdx.