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	<id>https://mizugadro.mydns.jp/t/index.php?action=history&amp;feed=atom&amp;title=Trigonometry</id>
	<title>Trigonometry - Revision history</title>
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	<updated>2026-04-04T06:52:55Z</updated>
	<subtitle>Revision history for this page on the wiki</subtitle>
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	<entry>
		<id>https://mizugadro.mydns.jp/t/index.php?title=Trigonometry&amp;diff=28255&amp;oldid=prev</id>
		<title>T: Text replacement - &quot;\$([^\$]+)\$&quot; to &quot;\\(\1\\)&quot;</title>
		<link rel="alternate" type="text/html" href="https://mizugadro.mydns.jp/t/index.php?title=Trigonometry&amp;diff=28255&amp;oldid=prev"/>
		<updated>2019-07-30T09:43:57Z</updated>

		<summary type="html">&lt;p&gt;Text replacement - &amp;quot;\$([^\$]+)\$&amp;quot; to &amp;quot;\\(\1\\)&amp;quot;&lt;/p&gt;
&lt;table class=&quot;diff diff-contentalign-left diff-editfont-monospace&quot; data-mw=&quot;interface&quot;&gt;
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				&lt;td colspan=&quot;2&quot; style=&quot;background-color: #fff; color: #202122; text-align: center;&quot;&gt;← Older revision&lt;/td&gt;
				&lt;td colspan=&quot;2&quot; style=&quot;background-color: #fff; color: #202122; text-align: center;&quot;&gt;Revision as of 09:43, 30 July 2019&lt;/td&gt;
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  &lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Line 1:&lt;/td&gt;
  &lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Line 1:&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
  &lt;td class=&quot;diff-marker&quot;&gt;&amp;#160;&lt;/td&gt;
  &lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;[[Trigonometry]] means set of tools to handle with combinations of functions [[sin]] and [[cos]], and also, the skills to use these tools. Some formulas of trigonometry are collected here.&lt;/div&gt;&lt;/td&gt;
  &lt;td class=&quot;diff-marker&quot;&gt;&amp;#160;&lt;/td&gt;
  &lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;[[Trigonometry]] means set of tools to handle with combinations of functions [[sin]] and [[cos]], and also, the skills to use these tools. Some formulas of trigonometry are collected here.&lt;/div&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
  &lt;td class=&quot;diff-marker&quot;&gt;&amp;#160;&lt;/td&gt;
  &lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;
  &lt;td class=&quot;diff-marker&quot;&gt;&amp;#160;&lt;/td&gt;
  &lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
  &lt;td class=&quot;diff-marker&quot;&gt;−&lt;/td&gt;
  &lt;td style=&quot;color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;&lt;del class=&quot;diffchange diffchange-inline&quot;&gt;$&lt;/del&gt;\cos[b] \sin[a] = \frac{1}{2} (\sin[a\! -\! b] + \sin[a\! +\! b])&lt;del class=&quot;diffchange diffchange-inline&quot;&gt;$&lt;/del&gt;&lt;/div&gt;&lt;/td&gt;
  &lt;td class=&quot;diff-marker&quot;&gt;+&lt;/td&gt;
  &lt;td style=&quot;color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;&lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;\(&lt;/ins&gt;\cos[b] \sin[a] = \frac{1}{2} (\sin[a\! -\! b] + \sin[a\! +\! b])&lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;\)&lt;/ins&gt;&lt;/div&gt;&lt;/td&gt;
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  &lt;td class=&quot;diff-marker&quot;&gt;&amp;#160;&lt;/td&gt;
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  &lt;td class=&quot;diff-marker&quot;&gt;&amp;#160;&lt;/td&gt;
  &lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;
&lt;/tr&gt;
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  &lt;td class=&quot;diff-marker&quot;&gt;&amp;#160;&lt;/td&gt;
  &lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;==References==&lt;/div&gt;&lt;/td&gt;
  &lt;td class=&quot;diff-marker&quot;&gt;&amp;#160;&lt;/td&gt;
  &lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;==References==&lt;/div&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;/table&gt;</summary>
		<author><name>T</name></author>
	</entry>
	<entry>
		<id>https://mizugadro.mydns.jp/t/index.php?title=Trigonometry&amp;diff=14910&amp;oldid=prev</id>
		<title>Maintenance script at 22:06, 30 November 2018</title>
		<link rel="alternate" type="text/html" href="https://mizugadro.mydns.jp/t/index.php?title=Trigonometry&amp;diff=14910&amp;oldid=prev"/>
		<updated>2018-11-30T22:06:42Z</updated>

		<summary type="html">&lt;p&gt;&lt;/p&gt;
&lt;p&gt;&lt;b&gt;New page&lt;/b&gt;&lt;/p&gt;&lt;div&gt;[[Trigonometry]] means set of tools to handle with combinations of functions [[sin]] and [[cos]], and also, the skills to use these tools. Some formulas of trigonometry are collected here.&lt;br /&gt;
&lt;br /&gt;
$\cos[b] \sin[a] = \frac{1}{2} (\sin[a\! -\! b] + \sin[a\! +\! b])$&lt;br /&gt;
&lt;br /&gt;
==References==&lt;br /&gt;
&amp;lt;references/&amp;gt;&lt;br /&gt;
&lt;br /&gt;
==Keywords==&lt;br /&gt;
&lt;br /&gt;
[[cos]],&lt;br /&gt;
[[exp]],&lt;br /&gt;
[[sin]]&lt;br /&gt;
&lt;br /&gt;
[[Categpory:Algebra]]&lt;br /&gt;
[[Category:cos]],&lt;br /&gt;
[[Category:English]]&lt;br /&gt;
[[Category:exp]],&lt;br /&gt;
[[Category:sin]]&lt;br /&gt;
[[Category:Trigonometry]]&lt;/div&gt;</summary>
		<author><name>Maintenance script</name></author>
	</entry>
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