[题目]设 _(k)=(int )_(0)^kpi (e)^(x^2)sin xdx(k=1,2,3), 则有 ()-|||-

5.设 _(1)=(int )_(0)^1xdx , _(2)=(int )_(0)^1sin xdx , _(3)=(int )_(0)^1tan xdx,

X=k =dfrac (c)(k!) ,=0, 1,2,3...... X=k =dfrac (c)(k!) ,=0, 1,2,3...... X=k =dfr

.(int )_(e)^x(sin )^2xdx.

.(int )_(e)^x(sin )^2xdx.

[题目]若-|||-=(int )_(0)^2(x)^2dx =(int )_(0)^2(x)^3dx, =(int )_(0)^2sin xdx, 则a,b,

(4) int (e)^x(sin )^2xdx.

[题目]设线性方程组 _(1)+(X)_(2)-(X)_(3)=-1-|||-(X)_(1)+K(X)_(2)-2(X)_(3)=0-|||-(X)_(1)+2

不定积分int (({e)^x+2)}^3(e)^xdx=()A、 int (({e)^x+2)}^3(e)^xdx=()B 、int (({e)^x+2)}^

[题目]计算: (int )_(-2)^2sin 2xdx= __

(int )_(0)^+infty x(2)^-xdx=( )(int )_(0)^+infty x(2)^-xdx=( )(int )_(0)^+inft