1/ Cm  cos A+ cos B+ cos C < $3\sqrt{2}$ - (sin A + sin B+ sin C)
  2/ Cm cos A + cos B + cos C+ sin A+ sin B+ sin C>3.
 3/ cho $ \triangle ABC$ vuông A có đường cao AH. Kẻ HE, HF lần lượt vuông góc vs AB, AC. Biết $ AH^{2}=4.AE.AF $. Tính các góc trong tam giác.

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