int_(1)^sqrt(3) dfrac(d x)(x^2 sqrt(1+x^2))

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

A.sqrt(1+x) B.(sqrt(1+x))/(2) C.(sqrt(1+x))/(sqrt(x)) D.(sqrt(1+x))/(2sqrt(x)

2.lim _(xarrow 1)dfrac (sqrt {3-x)-sqrt (1+x)}({x)^2+x-2}=2.

[题目] lim _(xarrow 1)dfrac (sqrt {3-x)-sqrt (1+x)}({x)^2+x-2}= __

lim _(xarrow 1)dfrac (sqrt {3-x)-sqrt (1+x)}({x)^2-1}-|||-__

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

(6) int_((1)/(sqrt(2)))^1(sqrt(1-x^2))/(x^2)dx;(6) $\int_{\frac{1}{\sqrt{2}}}^{1

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

=dfrac (sqrt {1+x)-sqrt (1-x)}(sqrt {1+x)+sqrt (1-x)}