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To prove the law of tangents one can start with the law of sines: = =, where is the diameter of the circumcircle, so that = and = .. It follows that
Prior to independence in the late 9th century, the area that became Đại Việt in northern Vietnam was ruled by the Tang dynasty as Annan. The hill dwellers on the western frontier of Annan and powerful chieftains such as Lý Do Độc allied with the state of Nanzhao in Yunnan and rebelled against the Tang dynasty in the 860s. They captured ...
Vị Thanh is a provincial city and also the capital city of Hậu Giang Province in Vietnam.Formerly, it was the capital town of Chương-Thiện province in South Vietnam.