$SinA+SinB+SinC+CosA+CosB+CosC = 3$
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Posted by tranhydong on 30-11-2012 - 17:27
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Góp vui 1 bài :
Bài 10 : Giả sử 10 điểm $A0,A1,...A9$ chia đường tròn bán kính R thành 10 cung bằng nhau. Chứng minh rằng $A0A3-A0A1=R$
Posted by tranhydong on 06-07-2012 - 11:25
Posted by tranhydong on 05-07-2012 - 09:00
Posted by tranhydong on 04-07-2012 - 15:01
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