(44) int dfrac ({x)^3+1}({({x)^2+1)}^2}dx.

(44) int dfrac ({x)^3+1}({({x)^2+1)}^2}dx.

(44) int dfrac ({x)^3+1}({({x)^2+1)}^2}dx,

int dfrac (2{x)^2-x-1}({x)^3+1}dx.

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

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

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

【65】int(x^2+1)/((x+1)^2)(x-1)dx.【65】$\int\frac{x^{2}+1}{(x+1)^{2}(x-1)}dx$.

9、 int dfrac (1)(({x)^2+1)(x)^2}dx= __ 。

int (x)^3(e)^-(x^2)dx=(,,,,,)A、dfrac(1)(2)(e)^-(x^2)((x)^2+1)+CB、-dfrac(1)(2)(e)

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