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

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

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

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

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

( 单选题 ) int dfrac ({e)^x}(1+{e)^2x}dx=_________int dfrac ({e)^x}(1+{e)^2x}dx=int

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

(int )_(-dfrac {pi )(2)}^dfrac (pi {2)}dfrac (|x|sin x)(1+{cos )^3x}dx=(int )_(-

求下列不定积分:-|||-(22) int dfrac (cos 2x)({cos )^2x(sin )^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=______.______.