int dfrac (1)(1+cos 2x)dx=______.

(int )_(0)^dfrac (pi {4)}dfrac (x)(1+cos 2x)dx=( ) .(int )_(0)^dfrac (pi {4)}dfr

.int dfrac (1+{cos )^2x}(1+cos 2x)dx

( 20 int dfrac (dx)(1+cos 2x) ;

计算下列不定积分int dfrac (1)(1+cos 2x)dx计算下列不定积分

(3) (int )_(0)^dfrac (pi {4)}dfrac (x)(1+cos 2x)dx= () .-|||-(A) dfrac (pi )(8)+

int dfrac (sin x)(1+{cos )^2x}dx=-|||-__

)int dfrac (1)({cos )^2x(sin )^2x}dx.

[题目] int dfrac (x+sin x)(1+cos x)dx,

(int )_(-dfrac {pi )(2)}^dfrac (pi {2)}((cos )^2x+dfrac (xcos x)(1+{cos )^2x})dx

求不定积分int dfrac (1)(2x)sqrt (ln x)dx=（）.int dfrac (1)(2x)sqrt (ln x)dx=int dfrac