534

See the figure,
({omega}[1]) is tangent to (O) (intenally), ({omega}[2]) is tangent to (O) (extenally).
{M}=({omega}[1])∩BC, AB,AC are tangent to ({omega}[2]).
Prove that: the incircle of ABC is on MN.

（Own）

It is also the generalization of Sawayama's Theroem.

Are you from Vietnam ?

這道題是我一位越南的網友最近問我的, 是他發現的, 而且我已經給出證明. 請問你是那位越南人嗎?

楼主你会中文啊，题目看半天，看懂了

Welcome to the tieba.By the way,why do you use baidu?Where are you from?