int (x)^2arctan xdx; ;
int (x)^2arctan xdx
(1) int (x)^2arctan xdx;
28、 dfrac (d)(dx)(int )_(1)^2arctan xdx= __-|||-_
int cos ln xdx.20. $\int \cos \ln xdx$.
13.计算不定积分 int dfrac ({x)^2arctan x}({x)^2+1}dx
(9) (int )_(-dfrac {pi )(2)}^dfrac (pi {2)}|sin x|arctan (e)^xdx
② lim _(xarrow 0)(x)^2arctan dfrac (1)(x);
(int )_(0)^+infty x(2)^-xdx=( )(int )_(0)^+infty x(2)^-xdx=( )(int )_(0)^+inft
计算(int )_(0)^1xarctan xdx.计算.