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Mathematics, 19.06.2021 06:00 cwater7

2. Cho đường tròn (O; R), đường kính AB cố định và đường kính CD thay đổi. Tiếp tuyến
với đường tròn (O) tại B cắt AC tại E, AD tại F. Tìm tập hợp trực tâm các tam giác CEF
và DEF.

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2. Cho đường tròn (O; R), đường kính AB cố định và đường kính CD thay đổi. Tiếp tuyến
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