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09-12-2007 - 10:24
Cho A,B,C là các góc của một tam giác
Chứng minh rằng:
1) $tanA+tanB+tanC \geq 3\sqrt{3}$ 2) $tan \dfrac{A}{2} +tan \dfrac{B}{2} +tan \dfrac{C}{2} \geq \sqrt{3} $