(5) int dfrac (arctan x)(1+{x)^2}dx= __

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

(int )_(0)^1arctan dfrac (x)(2)dx=()(int )_(0)^1arctan dfrac (x)(2)dx=()(int )_(

7.不定积分 int dfrac (arctan x)({x)^2(1+(x)^2)}dx= __

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

( 单选题 ) int dfrac ({e)^x}(1+{e)^2x}dx=_________int dfrac ({e)^x}(1+{e)^2x}dx=int

int dfrac ({(1-x))^2}(x(1+{x)^2)}dx

(19) int tan sqrt (1+{x)^2}cdot dfrac (xdx)(sqrt {1+{x)^2}}-|||-(20) int dfrac (

(19) int tan sqrt (1+{x)^2}cdot dfrac (xdx)(sqrt {1+{x)^2}}-|||-(20) int dfrac (

2.计算下列不定积分：(9)int dfrac (x{e)^arctan x}({(1+{x)^2)}^dfrac (3{2)}}dx.2.计算下列不定积分：(

int dfrac ({x)^3}(sqrt {1+{x)^2}}dx,