[题目] int dfrac (dx)(xln x)

[题目]求不定积分: int dfrac (1)(xln x)dx,

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

(6) int dfrac (1+ln x)({(xln x))^2}dx

[题目] int xcos dfrac (x)(2)dx

[题目] int xcos dfrac (x)(2)dx

[题目] int dfrac (x)(sqrt {1-{x)^2}}dx

[题目] int (cos )^2dfrac (x)(2)dx= __

[题目] (int )_(2)^4dfrac (1)(x)dx= __

计算下列不定积分.-|||-int dfrac ({e)^x(1+xln x)}(x)dx

[题目] int dfrac (xarctan x)(sqrt {1+{x)^2}}dx