(int )_(0)^dfrac (pi {2)}(e)^2xcos xdx

(int )_(0)^dfrac (pi {2)}(e)^2xcos xdx; ;

求 (int )_(0)^dfrac (pi {2)}(e)^2xcos xdx求

(6) (int )_(0)^dfrac (pi {2)}(sin )^2xcos xdx;

定积分(int )_(0)^dfrac (pi {2)}(e)^xsin xdx的值是(int )_(0)^dfrac (pi {2)}(e)^xsin xdx

[题目]计算定积分: (int )_(-dfrac {pi )(2)}^dfrac (pi {2)}dfrac (1)(2)xcos xdx.

不定积分 int (e)^2xcos 3xdx=

(9) (int )_(-dfrac {pi )(2)}^dfrac (pi {2)}|sin x|arctan (e)^xdx

(int )_(0)^dfrac (pi {2)}xsin xdx= ()-|||-

(int )_(0)^dfrac (pi {4)}(tan )^2xdx=1-dfrac (pi )(4) __-|||-__下列式子或叙述不正确的是A.B.设

int _0^piover2(rm e)^2xcos x(rm d)x$\int _0^{\pi\over2}{\rm e}^{2x}\cos x{\rm d}