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Cho nửa đường tròn O đường kính BC . Vẽ 2 tiếp tuyến Bx và Cy của ( O ) . Gọi A là điểm trên nửa đường tròn sao cho AB < AC . Tiếp tuyến tại A của ( O ) cắt Bx và Cy tại M và N. Chứng minh : a ) MN = BM + CN b ) OM ⊥ AB , OM // AC
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