Trang Ánh Nam has left a new comment on your post "CÁC HỆ THỨC LƯỢNG TRONG TAM GIÁC VÀ GIẢI TAM GIÁC":
Cho tam giác ABC không cân có: c/b=m(B)/m(C). CHứng minh rằng 2 cotA=cotB+cotC
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Posted by Trang Ánh Nam to Học Để Thi at February 21, 2019 at 10:58 PM
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