int dfrac ({x)^3}(9+{x)^2}dx

(32) int dfrac ({x)^3}(9+{x)^2}dx=

不定积分int dfrac (dx)(4{x)^2-9}=-|||-__.int dfrac (dx)(4{x)^2-9}=-|||-__int dfrac (

(9) int dfrac (x{e)^arctan x}({(1+{x)^2)}^dfrac (3{2)}}dx ;

int dfrac ({x)^3}({(1+{x)^2)}^2}dx=A.int dfrac ({x)^3}({(1+{x)^2)}^2}dx=B.int df

int dfrac (sqrt {{x)^2-9}}(x)dx

(2) int dfrac (sqrt {{x)^2-9}}(x)dx

int dfrac (1)({x)^2}sin dfrac (3)(x)dx= __

int dfrac (x)(3-2{x)^2}dx;

9、 int dfrac (1)(({x)^2+1)(x)^2}dx= __ 。

9.int x(cos )^2dfrac (x)(2)dx9.