(B)| (x/(1+2)^2 (1+x^2)^2 dx=0.-|||-(C) (int )_(-1)^1dfrac (1)(sin x)dx=0. (D) (int )_(-infty )^+infty (e)^-|x|dx=1.

(4) (int )_(0)^+infty dfrac (dx)((1+x)(1+{x)^2)}

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

(int )_(0)^1dfrac (dx)({x)^2sqrt (1-x)} 发散-|||-D (int )_(0)^1dfrac (dx)(xsqrt {1

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

1.以下各积分不属于反常积分的是 () .-|||-(A) (int )_(0)^+infty ln (1+x)dx (B) (int )_(0)^1dfrac

(int )_(0)^1dfrac (x)(sqrt {1-{x)^2}}dx= [填空1]

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

int dfrac (1+2{x)^2}({x)^2(1+(x)^2})dx_____._____.

int dfrac (1+2{x)^2}({x)^2(1+(x)^2})dx_____._____.

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