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Cho điểm A nằm bên ngoài đường trong (O) từ A kẻ hai tiếp tuyến AB AC với đường tròn (B,C là tiếp điểm) gọi M là Trung điểm của AB đường thẳng MC cắt đường tròn (O). Tai N (N khác C) a) chứng minh ABOC là tứ giác nội tiếp b) chứng minh MB²=MN*MC c) tia AN cắt đường tròn (O) tại D (D khác N) chứng minh góc MAN =góc ADC
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