<?xml version="1.0" encoding="UTF-8"?><rss version="2.0"
	xmlns:content="http://purl.org/rss/1.0/modules/content/"
	xmlns:dc="http://purl.org/dc/elements/1.1/"
	xmlns:atom="http://www.w3.org/2005/Atom"
	xmlns:sy="http://purl.org/rss/1.0/modules/syndication/"
	 xmlns:media="http://search.yahoo.com/mrss/" 
	>
<channel>
	<title>
	Các bình luận về: Đề bài: Cho tam giác $ABC$ thỏa mãn:   $\cos A + \cos B+\cos C =\sin \frac{ A}{ 2} + \sin \frac{ B}{ 2} +\sin \frac{C }{ 2}   (1)$.Chứng minh  $\Delta ABC$ đều.	</title>
	<atom:link href="https://booktoan.com/de-bai-cho-tam-giac-abc-thoa-man-cos-a-cos-bcos-c-sin-frac-a-2-sin-frac-b-2-sin-fracc-2-1-chung-minh-delta-abc-deu.html/feed" rel="self" type="application/rss+xml" />
	<link>https://booktoan.com/de-bai-cho-tam-giac-abc-thoa-man-cos-a-cos-bcos-c-sin-frac-a-2-sin-frac-b-2-sin-fracc-2-1-chung-minh-delta-abc-deu.html</link>
	<description>Học toán, Đề thi toán, Sách giáo khoa Toán, trắc nghiệm Toán online</description>
	<lastBuildDate>Sat, 10 Jul 2021 17:00:00 +0000</lastBuildDate>
	<sy:updatePeriod>
	hourly	</sy:updatePeriod>
	<sy:updateFrequency>
	1	</sy:updateFrequency>
	<generator>https://wordpress.org/?v=7.1.2</generator>
</channel>
</rss>
