Trang Ánh Nam has left a new comment on your post "CÁC HỆ THỨC LƯỢNG TRONG TAM GIÁC VÀ GIẢI TAM GIÁC":
Bài 37: CHo tam giác ABC thỏa mãn a^4=b^4+c^4. CHứng minh rằng:
a. Tam giác ABC nhọn.
b. 2(sinA)^2=tanB.tanC
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Posted by Trang Ánh Nam to Học Để Thi at February 21, 2019 at 10:48 PM
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