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

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

下列公式错误的是A.int dfrac (1)({a)^2+(x)^2}dx=arctan dfrac (x)(a)+C,(aneq 0)B.int dfrac

[题目]计算 (int )_(1)^+infty dfrac (arctan x)({x)^2}dx

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

求：int dfrac (arctan sqrt {x)}(sqrt {x)(1+x)}dx求：

计算int dfrac (arctan sqrt {x)}(sqrt {x)(1+x)}dx计算

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

(int )_(0)^dfrac (pi {4)}dfrac (x)(1+cos 2x)dx=( ) .(int )_(0)^dfrac (pi {4)}dfr

[题目]求 int dfrac (arctan {e)^x}({e)^2x}dx

(int )_(0)^1dfrac (x+2)(sqrt {x+1)}dx=( )(int )_(0)^1dfrac (x+2)(sqrt {x+1)}dx=