[题目]计算定积分: (int )_(0)^1xarctan xdx.

计算(int )_(0)^1xarctan xdx.计算.

[题目]计算定积分: (int )_(-dfrac {pi )(2)}^dfrac (pi {2)}dfrac (1)(2)xcos xdx.

计算定积分 int_(0)^pi sin xdx= ( )A. 1B. -1C. 2D. -2

计算题（每小题11分，本题共44分）拍照题 11/15计算定积分int_(0)^(pi)/(2)xcos xdx.计算题（每小题11分，本题共44分）拍照题 1

[题目]定积分 (int )_(0)^pi xcos xdx= __

[题目]计算定积分 (int )_(0)^1dfrac (1)(1+sqrt {x)}dx.

int cos ln xdx.20. $\int \cos \ln xdx$.

7.计算下列定积分:-|||-(1) (int )_(0)^1x(e)^-xdx ;-|||-(2)(int )_(1)^xxln xdx;-|||-(3) (

计算定积分 (int )_(0)^1(2x+1)dx.

(18)int x^2arctan xdx.(18)$\int x^{2}\arctan xdx$.