求int dfrac (4{x)^5-3(x)^4+3x}(1+{x)^2}dx

int dfrac ({x)^3}({(1+{x)^2)}^2}dx=A.int dfrac ({x)^3}({(1+{x)^2)}^2}dx=B.int df

int dfrac (x+{x)^3}(1+{x)^4}dx

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

已知(x)=dfrac (xcos x)(1+{x)^4}+(x)^2-(int )_(-1)^1f(x)dx,则(x)=dfrac (xcos x)(1+{x

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

(int )_(-1)^1(dfrac (sin x+1)(1+{x)^2}+(x)^4)dxA (int )_(-1)^1(dfrac (sin x+1)(

已知(x-dfrac (1)(x))=dfrac ({x)^3-x}(1+{x)^4}-|||-__，求(x-dfrac (1)(x))=dfrac ({x)^

(9) int dfrac (x{e)^arctan x}({(1+{x)^2)}^dfrac (3{2)}}dx ;

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

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