Cho đường tròn (O) , hai đường kính AB và CD vuông góc với nhau . M là một điểm di động trên cung nhỏ AC . Gọi I là giao điểm của BM và CD . Tiếp tuyến tại M của (O) cắt tia DC tại K . Tia phân giác của góc MOK cắt BM tại N a) CM : AMIO là tứ giác nội tiếp b) CM IN. IB =IO.IC

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