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Cho đường tròn (0) có dây AB. Lấy điểm C thuộc tia đổi của tia BA. Từ C kẻ các tiếp tuyển CM và CN với đường tròn (M thuộc cung nhỏ AB, N thuộc cung lớn AB). Lấy D là điểm chính giữa của cung lớn AB, DM cắt AB tại E a) Chứng minh CM=CE . b) Chứng minh EA.NB =NA.EB. . c) Gọi I là trung điểm của dây AB. Chứng minh năm điểm M.C.N.O vàI cùng thuộc một đường tròn
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