$\int {x}^{3}{e}^{-{x}^{2}}dx=$$\left(\,\,\,\,\,\right)$
$A、$$\dfrac{1}{2}{e}^{-{x}^{2}}\left({x}^{2}+1\right)+C$
$B、$$-\dfrac{1}{2}{e}^{-{x}^{2}}\left({x}^{2}+1\right)+C$
$C、$$\dfrac{1}{2}{e}^{-{x}^{2}}\left({x}^{2}-1\right)+C$
$D、$$-\dfrac{1}{2}{e}^{-{x}^{2}}\left({x}^{2}-1\right)+C$
int dfrac ({x)^2}({x)^2+1}dx ,
9、 int dfrac (1)(({x)^2+1)(x)^2}dx= __ 。
int dfrac ({x)^2+1}({(x+1))^2(x-1)}dx；；
.int dfrac ({(x+1))^2}({({x)^2+1)}^2}dx.
(44) int dfrac ({x)^3+1}({({x)^2+1)}^2}dx,
(43) int dfrac ({x)^3+1}({({x)^2+1)}^2}dx ;
(44) int dfrac ({x)^3+1}({({x)^2+1)}^2}dx.
(44) int dfrac ({x)^3+1}({({x)^2+1)}^2}dx.
.已知 (dfrac (1)(x))=dfrac (4)(x)+2(x)^2+1, 求f(x), ((x)^2+1)
( 单选题 ) int dfrac ({e)^x}(1+{e)^2x}dx=_________int dfrac ({e)^x}(1+{e)^2x}dx=int