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Cho nửa đường tròn đường kính AB. Kẻ 2 tiếp tuyến Ax;By với nửa đường tròn. Lấy M thuộc nửa đường tròn, kẻ tiếp tuyến tại M cắt Ax ; By tại D và C. CMR: a) AD+BC=CD b) Tam giác COD vuông c) Tia BM cắt Ax tại E. CMR: D là trung điểm AE d) Kẻ MH vuông góc AB. CMR: AC đi qua trung điểm MH e) Tìm vị trí M để MHO có diện tích nhỏ nhất P/s mình chỉ cần câu e thôi ạ, giúp mình với
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