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

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

int dfrac (cos 2x)(cos x+sin x)dx

5.求不定积分 int dfrac ({sin )^2x}(1+{sin )^2x}dx.

求下列不定积分:-|||-(22) int dfrac (cos 2x)({cos )^2x(sin )^2x}dx ;

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

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

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

(sin x)=dfrac (1)({cos )^2x} in (0,dfrac (pi )(2)),则(sin x)=dfrac (1)({cos )^2x}

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

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