求下列不定积分:-|||-int dfrac (1+2{x)^2}({x)^2(1+(x)^2)}dx ;

2.求下列不定积分:-|||-(1) int dfrac (dx)({x)^2};-|||-(2) int xsqrt (x)dx; 2.求下列不定积

2.求下列不定积分.-|||-(2) int dfrac (1)((1+2x)(1+{x)^2)}dx;

求不定积分int (x)^2(ln x-dfrac (1)(1+{x)^2})dx.求不定积分.

2.求下列不定积分:-|||-(14) int (dfrac (3)(1+{x)^2}-dfrac (2)(sqrt {1-{x)^2}})dx;

求下列不定积分:-|||-(2) int dfrac (1)({x)^2+2x+2}dx;

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

求下列不定积分：int ln (sqrt (1+{x)^2}-x)dx。求下列不定积分：。

求下列不定积分：int dfrac (x+1)({x)^2+2x+5}dx;求下列不定积分：;

求下列不定积分int ln (x+sqrt (1+{x)^2})dx求下列不定积分

5.求不定积分 int dfrac ({sin )^2x}(1+{sin )^2x}dx.