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83 lines
3.9 KiB
HTML
83 lines
3.9 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>正弦</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.sin" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">sin</h1>
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<p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">sin</span> — <span class="dc-title">正弦</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.sin-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>sin</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>sin()</strong></span> 返回参数 <code class="parameter">arg</code> 的正弦值。参数 <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.sin-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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单位是弧度的值。
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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.sin-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para"><code class="parameter">arg</code> 的正弦值
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.sin-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-4144">
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<p><strong>Example #1 <span class="function"><strong>sin()</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: #FF8000">// 返回值的精度由配置中的 precision 指示确定<br /></span><span style="color: #007700">echo </span><span style="color: #0000BB">sin</span><span style="color: #007700">(</span><span style="color: #0000BB">deg2rad</span><span style="color: #007700">(</span><span style="color: #0000BB">60</span><span style="color: #007700">)); </span><span style="color: #FF8000">// 0.866025403 ...<br /></span><span style="color: #007700">echo </span><span style="color: #0000BB">sin</span><span style="color: #007700">(</span><span style="color: #0000BB">60</span><span style="color: #007700">); </span><span style="color: #FF8000">// -0.304810621 ...<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.sin-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="asin.html" class="function" rel="rdfs-seeAlso">asin()</a> - 反正弦</span></li>
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<li class="member"><span class="function"><a href="sinh.html" class="function" rel="rdfs-seeAlso">sinh()</a> - 双曲正弦</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="tan.html" class="function" rel="rdfs-seeAlso">tan()</a> - 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> |