Trang Ánh Nam has left a new comment on your post "CÁC HỆ THỨC LƯỢNG TRONG TAM GIÁC VÀ GIẢI TAM GIÁC":
Bài 49: CMR,tam giác ABC có 3 góc thỏa mãn điều kiện: sinA+SinB+sinC =sin2A+sin2B+sin2C
thì tam giác ABC là tam giác đều.
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Posted by Trang Ánh Nam to Học Để Thi at February 21, 2019 at 11:11 PM
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