int dfrac ({(x+1))^2}({x)^2}dx=
int dfrac (x+1)({x)^2+x+1}dx.
(int )_(0)^1dfrac (x+2)(sqrt {x+1)}dx=( )(int )_(0)^1dfrac (x+2)(sqrt {x+1)}dx=
int dfrac ({x)^2+1}({(x+1))^2(x-1)}dx;;
int dfrac (x+1)({x)^2+4x+13}dx
.int dfrac ({(x+1))^2}({({x)^2+1)}^2}dx.
;(11) int dfrac (x+1)({x)^2+2x+5}dx ;
(int )_(-1)^1(dfrac (sin x+1)(1+{x)^2}+(x)^4)dxA (int )_(-1)^1(dfrac (sin x+1)(
int dfrac (dx)(sqrt [3]{{(x+1))^2((x-1))^4}}
int dfrac (dx)(sqrt [3]{{(x+1))^2((x-1))^4}}