计算(int )_(0)^1xarctan xdx.

[题目]计算定积分: (int )_(0)^1xarctan xdx.

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

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

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

5.设 _(1)=(int )_(0)^1xdx , _(2)=(int )_(0)^1sin xdx , _(3)=(int )_(0)^1tan xdx,

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

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

(int )_(0)^+infty x(2)^-xdx=( )(int )_(0)^+infty x(2)^-xdx=( )(int )_(0)^+inft

(tan )^3xsec xdx..

定积分(int )_(0)^3(2)^xdx=( ).A.(int )_(0)^3(2)^xdx=B.(int )_(0)^3(2)^xdx=C.(in