Trang Ánh Nam has left a new comment on your post "CÁC HỆ THỨC LƯỢNG TRONG TAM GIÁC VÀ GIẢI TAM GIÁC":
Bài 48: Cho tam giác ABC thỏa : sin(A + B).cos(A - B) = 2sinA.sinB. CMR, tam giác ABC vuông.
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Posted by Trang Ánh Nam to Học Để Thi at February 21, 2019 at 11:10 PM
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