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(int )_(0)^pi ((xsin x))^2dx; ;
int ((arcsin x))^2dx.
(int )_(-pi )^pi sqrt ({pi )^2-(x)^2}dx= )(int )_(-pi )^pi sqrt ({pi )^2-(x)^2}d
定积分(int )_(0)^dfrac (pi {2)}(e)^xsin xdx的值是(int )_(0)^dfrac (pi {2)}(e)^xsin xdx
(int )_(0)^2pi |sin x|dx.
int_(0)^pi/2(cos x+2)dx=( ).A. $\pi+1$B. $\pi$C. 2D. $\pi/2+2$
(int )_(0)^dfrac (pi {2)}xsin xdx= ()-|||-
(int )_(0)^dfrac (pi {4)}dfrac (x)(1+cos 2x)dx=( ) .(int )_(0)^dfrac (pi {4)}dfr
int (e)^-2xsin dfrac (x)(2)dx; ;
例: (int )_(0)^dfrac (pi {2)}(cos )^2dfrac (x)(2)dx= __ .