Cho tam giác ABC vuông tại A có đường cao AH. Vẽ HE vuông góc với AB tại E, HF vuông góc với AC tại F. a) Cho biết AB = 3cm, AC = 4cm. Tính độ dài các đoạn HB, HC, AH b) Chứng minh: AE.EB + AF.FC = AH2 c) Chứng minh: BE = BC.cos3.B

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