(int )_(-2)^2dfrac (x+|x|)(2+{x)^2}dx=
9.int x(cos )^2dfrac (x)(2)dx9.
[题目] int (cos )^2dfrac (x)(2)dx= __
(int )_(1)^2dfrac (dx)(x(1+sqrt {2x))}=( )A.(int )_(1)^2dfrac (dx)(x(1+sqrt {2x
(int )_(1)^2dfrac (sqrt {{x)^2-1}}(x)dx
例28 计算下列积分:-|||-(1) (int )_(0)^2dfrac (x)({e)^x+(e)^2-x}dx ;
(int )_(0)^2dfrac (dx)({(1-x))^2};;
(int )_(0)^2dfrac (dx)({(1-x))^2};
例: (int )_(0)^dfrac (pi {2)}(cos )^2dfrac (x)(2)dx= __ .
dfrac (dy)(dx)=(x)^2+(y)^2 B . dfrac (dy)(dx)=(x)^2+(y)^2 C .dfrac (dy)(dx)=(x)^