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86 lines
3.4 KiB
HTML
86 lines
3.4 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<head>
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<meta http-equiv="content-type" content="text/html; charset=UTF-8">
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<title>正切</title>
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</head>
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<body class="docs"><div id="layout">
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<div id="layout-content"><div id="function.tan" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">tan</h1>
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<p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">tan</span> — <span class="dc-title">正切</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.tan-description">
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<h3 class="title">说明</h3>
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<div class="methodsynopsis dc-description">
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<span class="methodname"><strong>tan</strong></span>
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( <span class="methodparam"><span class="type">float</span> <code class="parameter">$arg</code></span>
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) : <span class="type">float</span></div>
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<p class="para rdfs-comment">
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<span class="function"><strong>tan()</strong></span> 返回参数 <code class="parameter">arg</code> 的正切值。参数
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<code class="parameter">arg</code> 的单位为弧度。
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.tan-parameters">
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<h3 class="title">参数</h3>
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<p class="para">
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<dl>
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<dt>
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<code class="parameter">arg</code></dt>
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<dd>
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<p class="para">
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要处理的以弧度为单位的参数
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</p>
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</dd>
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</dl>
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</p>
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</div>
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<div class="refsect1 returnvalues" id="refsect1-function.tan-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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<code class="parameter">arg</code> 的正切值
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.tan-examples">
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<h3 class="title">范例</h3>
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<p class="para">
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<div class="example" id="example-4147">
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<p><strong>Example #1 <span class="function"><strong>tan()</strong></span> 例子</strong></p>
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<div class="example-contents">
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<div class="phpcode"><pre><span style="color: #000000">
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<span style="color: #0000BB"><?php<br /><br /></span><span style="color: #007700">echo </span><span style="color: #0000BB">tan</span><span style="color: #007700">(</span><span style="color: #0000BB">M_PI_4</span><span style="color: #007700">); </span><span style="color: #FF8000">// 1<br /><br /></span><span style="color: #0000BB">?></span>
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</span>
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</pre></div>
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</div>
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</div>
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</p>
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</div>
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<div class="refsect1 seealso" id="refsect1-function.tan-seealso">
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<h3 class="title">参见</h3>
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<p class="para">
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<ul class="simplelist">
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<li class="member"><span class="function"><a href="atan.html" class="function" rel="rdfs-seeAlso">atan()</a> - 反正切</span></li>
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<li class="member"><span class="function"><a href="atan2.html" class="function" rel="rdfs-seeAlso">atan2()</a> - 两个参数的反正切</span></li>
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<li class="member"><span class="function"><a href="sin.html" class="function" rel="rdfs-seeAlso">sin()</a> - 正弦</span></li>
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<li class="member"><span class="function"><a href="cos.html" class="function" rel="rdfs-seeAlso">cos()</a> - 余弦</span></li>
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<li class="member"><span class="function"><a href="tanh.html" class="function" rel="rdfs-seeAlso">tanh()</a> - 双曲正切</span></li>
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<li class="member"><span class="function"><a href="deg2rad.html" class="function" rel="rdfs-seeAlso">deg2rad()</a> - 将角度转换为弧度</span></li>
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</ul>
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</p>
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</div>
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</div></div></div></body></html> |