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21-11-2013 - 16:25
Giải hệ phương trình
10-11-2013 - 21:18
30-10-2013 - 18:52
23-10-2013 - 20:09
Giải phương trình
(tan x)^2 + (tan 2x)^2 + (tan 3x)^2 =1