[题目] int xcos dfrac (x)(2)dx

[题目] int xcos dfrac (x)(2)dx

【题目】-|||-dfrac (d)(dx)(int )_(sin x)^cos xcos (pi (t)^2)dt .

【题目】-|||-dfrac (d)(dx)(int )_(sin x)^cos xcos (pi (t)^2)dt .

计算：int dfrac (1)(sin xcos x)dx计算：

[题目] int (cos )^2dfrac (x)(2)dx= __

(int )_(-dfrac {pi )(2)}^dfrac (pi {2)}((cos )^2x+dfrac (xcos x)(1+{cos )^2x})dx

[题目] int dfrac (x)(sqrt {1-{x)^2}}dx

[题目] (int )_(2)^4dfrac (1)(x)dx= __

[题目] int dfrac (dx)(xln x)

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