V
vipchjpboy
![](https://blog.hocmai.vn/wp-content/uploads/2017/07/hot.gif)
![](https://blog.hocmai.vn/wp-content/uploads/2017/07/hot.gif)
tich phan tu` 0->(pi/2)^2 Cua?sin(can bac 3cua?x) dx nho' gia? chi tiet Cho tui hieu?
TK truoc************************************************.................... hihihihi`
TK truoc************************************************.................... hihihihi`