<?xml version="1.0" encoding="utf-8"?><?xml-stylesheet type='text/xsl' href='general.xsl'?><root><node type="title" content="Теорема тангенсов" /><node type="text" content="&lt;p style=&quot;margin: 0 0 0 0; text-indent: 1em;&quot; /&gt;&lt;b&gt;Теорема тангенсов&lt;/b&gt;&lt;p style=&quot;margin: 0 0 0 0; text-indent: 1em;&quot; /&gt;Если a, b – длины сторон треугольника, &lt;img src=&quot;../../_Content/MathML/Content_Node/Content/50416/out1-0.gif&quot; alt=&quot;&quot; class=&quot;mmlimage&quot; height=&quot;24&quot; width=&quot;16&quot; align=&quot;middle&quot; /&gt;, &lt;img src=&quot;../../_Content/MathML/Content_Node/Content/50416/out1-1.gif&quot; alt=&quot;&quot; class=&quot;mmlimage&quot; height=&quot;38&quot; width=&quot;17&quot; align=&quot;middle&quot; /&gt; – величины противоположных углов, то верна формула Региомонтана:&#xD;&lt;p style=&quot;margin: 0 0 0 0; text-indent: 1em;&quot; /&gt;&lt;center&gt;&lt;img src=&quot;../../_Content/MathML/Content_Node/Content/50416/out1-2.gif&quot; alt=&quot;&quot; class=&quot;mmlimage&quot; height=&quot;72&quot; width=&quot;142&quot; align=&quot;middle&quot; /&gt;.&lt;/center&gt;" style="Rule" /><node type="text" content="&lt;p style=&quot;margin: 0 0 0 0; text-indent: 1em;&quot; /&gt;&lt;img src=&quot;../../_Content/Mathematics/Geometry/Planimetriya_01/01_43.png&quot; width=&quot;350&quot; height=&quot;280&quot; align=&quot;top&quot; /&gt;" style="Skill" /></root>