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Member Since 11-07-2016
Offline Last Active 25-07-2016 - 20:09

15-07-2016 - 13:12

$2sin(54\deg)=2sin(\frac{3}{10}\pi)=\frac{\sqrt{16+\sqrt{160+32\sqrt{5}}}+\sqrt{16-\sqrt{160+32\sqrt{5}}}}{4}$ là số vô tỷ.

11-07-2016 - 17:24

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