Edited by coffee@_180188, 15-10-2008 - 18:55.
giải phương trình
Started By coffee@_180188, 15-10-2008 - 18:54
#1
Posted 15-10-2008 - 18:54
coffee@_180188
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Lính mới
$5^{\sin^2 x}+5^{\cos^2 x} = 5+\cos {5y}$
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