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

已知 (x+dfrac (1)(x))=dfrac (x+{x)^3}(1+{x)^4} ,求 f(x)

dfrac (1)(2)x+dfrac (1)(3)=dfrac (1)(4)x-dfrac (1)(5)

[题目]若 (x+dfrac (1)(x))=dfrac (x+{x)^3}(1+{x)^4} 求f(x).

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

讨论下列函数的有界性：(1) (x)=dfrac (x)(1+{x)^2}-|||-(2) (x)=dfrac (1+{x)^2}(1+{x)^4}讨论下列函数

【题文】已知：(x-dfrac (1)(x))=(x)^2+dfrac (1)({x)^2}-|||-__，则f(x)=________.【题文】已知：，则f(

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

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

(3) =dfrac (sqrt {x+2)((3-x))^4}({(x+1))^5}