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Cho đường tròn (O) và điểm M nằm ngoài đường tròn vẽ tiếp tuyến MA và cát tuyến MCD,nối MO(Tia MD nằm giữa 2 tia MO và MA) a)CHứng minh $x^{MA}$ = MC.MD b) VẽAH ⊥MO.Chứng minh ΔMCH đồng dạng ΔMOD c)Chứng minh tg CHOD nội tiếp d)Chứng minh HA là phân giác góc CHD
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