cho đường tròn O đường kính AB và dây cung CD vuông góc vs AB tại F . Trên cung BC lấy M nối A vs M cắt CD tại E. 1 CM AM là phân giác ^CMD 2 CM tứ giác EFBM nội tiếp 3 CM AC^2=AE.AM 4 gọi AM giao BC tại N DM giao AM tại I. CM IN//CD 5 CM N là tâm đường tròn nội tiếp tam giác CIM

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