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There have been 1 items by Anh Lino (Search limited from 25-05-2020)
Posted by Anh Lino on 29-06-2015 - 13:00 in Phương trình, Hệ phương trình Lượng giác
$sin^3 x.cos 3x + cos^3 x.sin 3x = sin^3 4x$