int t(e)^-2tdt.-|||-.int (ln )^2xdx-|||-.int xsin xcos xdx.-|||-15. int (x)^2(cos )^2dfrac (x)(2)dx --|||-16. int xln (x-1)dx .-|||-17. int ((x)^2-1)sin 2xdx --|||-18. int dfrac ({ln )^3x}({x)^2}dx.-|||-19. int (e)^sqrt [3](x)dx --|||-.int cos ln xdx.-|||-21. int ((arcsin x))^2dx.-|||-.int (e)^x(sin )^2xdx.-|||-.int xln (x)^2xdx.-|||-24. int (e)^sqrt (3x+9)dx -

int 1(e)^-2tdt-|||-.(int )_(1)^2xdx.-|||-.fxsin xcos xdx.-|||-15. int (x)^2(cos

int (x)^2cos xdx.-|||-12. int t(e)^-2tdt..-|||-13.|nn^2xdx.-|||-.fxsin xcos xdx.

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

[题目] int (cos )^2dfrac (x)(2)dx= __

int ((x)^2-1)sin 2xdx.-|||-18. int dfrac ({ln )^3x}({x)^2}dx.

定积分(int )_(0)^dfrac (pi {2)}(e)^xsin xdx的值是(int )_(0)^dfrac (pi {2)}(e)^xsin xdx

9.int x(cos )^2dfrac (x)(2)dx9.

(15)int (x)^3(ln )^2xdx;

填空:-|||-(1) int (x)^3(e)^xdx= __ ;-|||-(2) int dfrac (x+5)({x)^2-6x+13}dx= __

不定积分int (({e)^x+2)}^3(e)^xdx=()A、 int (({e)^x+2)}^3(e)^xdx=()B 、int (({e)^x+2)}^