Bài toán: Cho $A,B,C$ là 3 góc của 1 tam giác bất kỳ.Chứng minh rằng:
$$2<\sum_{A,B,C}\left(\frac{\sin{A}}{A} \right) \le \frac{9\sqrt{3}}{2\pi}$$
$$2<\sum_{A,B,C}\left(\frac{\sin{A}}{A} \right) \le \frac{9\sqrt{3}}{2\pi}$$
Started By dark templar, 26-01-2012 - 17:28
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Posted 26-01-2012 - 17:28
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