http://dientuvietnam.net/cgi-bin/mimetex.cgi?\triangleABC
1/http://dientuvietnam.net/cgi-bin/mimetex.cgi?\vec{OH}=\vec{OA}+\vec{OB}+\vec{OC}
3/http://dientuvietnam.net/cgi-bin/mimetex.cgi?SinA.\vec{IA}+SinB.\vec{IB}+SinC.\vec{IC}=\vec{0}
5/http://dientuvietnam.net/cgi-bin/mimetex.cgi?Sin2A.\vec{OA}+Sin2B.\vec{OB}+Sin2C.\vec{OC}=\vec{0}
Bài viết đã được chỉnh sửa nội dung bởi PTDUNG-KOPPERNIGK: 22-03-2005 - 18:12