.(int )_(e)^x(sin )^2xdx.
(4) int (e)^x(sin )^2xdx.
A int cos xdx=sin x+CB int cos xdx=sin x+CC int cos xdx=sin x+CD int cos xdx=sin
cos 2x(e)^-x+ sin 2x(e)^-xdx-|||-B.cos2xe^(-x)- sin 2x(e)^-xdx-|||-. cos 2x(e)^
(9) (int )_(-dfrac {pi )(2)}^dfrac (pi {2)}|sin x|arctan (e)^xdx
不定积分int (({e)^x+2)}^3(e)^xdx=()A、 int (({e)^x+2)}^3(e)^xdx=()B 、int (({e)^x+2)}^
(2) int x(e)^-xdx;
int (sin )^3x(cos )^5xdx= __ A.int (sin )^3x(cos )^5xdx= __ B.int (sin )
[题目]设 _(k)=(int )_(0)^kpi (e)^(x^2)sin xdx(k=1,2,3), 则有 ()-|||-
int sin xdx=cos x+cA. 对B. 错