int (x)^2cos xdx.-|||-12. int t(e)^-2tdt..-|||-13.|nn^2xdx.-|||-.fxsin 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 ((arctan x))^2dx.-|||-.(e)^x(sin )^2xdx.-|||-23.|xln^2xdx.-|||-24. int (e)^sqrt (3x+9)dx.

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

int t(e)^-2tdt.-|||-.int (ln )^2xdx-|||-.int xsin xcos xdx.-|||-15. int (x)^2(co

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

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

(2) int x(e)^-xdx;

(单选题) (int )_(0)^2pi (x)^2cos xdx= ().-|||-

A int cos xdx=sin x+CB int cos xdx=sin x+CC int cos xdx=sin x+CD int cos xdx=sin

.(int )_(e)^x(sin )^2xdx.

.(int )_(e)^x(sin )^2xdx.

(15)int_(-(pi)/(2))^(pi)/(2)sqrt(cos x-cos^3)xdx;(15)$\int_{-\frac{\pi}{2}}^{\fr