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<title>Cosine</title>
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<h1 class="refname">cos</h1>
<p class="verinfo">(PHP 4, PHP 5)</p><p class="refpurpose"><span class="refname">cos</span> — <span class="dc-title">Cosine</span></p>
</div>
<div class="refsect1 description" id="refsect1-function.cos-description">
<h3 class="title">Description</h3>
<div class="methodsynopsis dc-description">
<span class="type">float</span> <span class="methodname"><strong>cos</strong></span>
( <span class="methodparam"><span class="type">float</span> <code class="parameter">$arg</code></span>
)</div>
<p class="para rdfs-comment">
<span class="function"><strong>cos()</strong></span> returns the cosine of the <em><code class="parameter">arg</code></em>
parameter. The <em><code class="parameter">arg</code></em> parameter is in radians.
</p>
</div>
<div class="refsect1 parameters" id="refsect1-function.cos-parameters">
<h3 class="title">Parameters</h3>
<p class="para">
<dl>
<dt>
<span class="term"><em><code class="parameter">arg</code></em></span>
<dd>
<p class="para">
An angle in radians
</p>
</dd>
</dt>
</dl>
</p>
</div>
<div class="refsect1 returnvalues" id="refsect1-function.cos-returnvalues">
<h3 class="title">Return Values</h3>
<p class="para">
The cosine of <em><code class="parameter">arg</code></em>
</p>
</div>
<div class="refsect1 examples" id="refsect1-function.cos-examples">
<h3 class="title">Examples</h3>
<p class="para">
<div class="example" id="example-3452">
<p><strong>Example #1 <span class="function"><strong>cos()</strong></span> example</strong></p>
<div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB"><?php<br /><br /></span><span style="color: #007700">echo </span><span style="color: #0000BB">cos</span><span style="color: #007700">(</span><span style="color: #0000BB">M_PI</span><span style="color: #007700">); </span><span style="color: #FF8000">// -1<br /><br /></span><span style="color: #0000BB">?></span>
</span>
</code></div>
</div>
</div>
</p>
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<div class="refsect1 seealso" id="refsect1-function.cos-seealso">
<h3 class="title">See Also</h3>
<p class="para">
<ul class="simplelist">
<li class="member"> <span class="function"><a href="function.acos.html" class="function" rel="rdfs-seeAlso">acos()</a> - Arc cosine</span></li>
<li class="member"> <span class="function"><a href="function.sin.html" class="function" rel="rdfs-seeAlso">sin()</a> - Sine</span></li>
<li class="member"> <span class="function"><a href="function.tan.html" class="function" rel="rdfs-seeAlso">tan()</a> - Tangent</span></li>
<li class="member"> <span class="function"><a href="function.deg2rad.html" class="function" rel="rdfs-seeAlso">deg2rad()</a> - Converts the number in degrees to the radian equivalent</span></li>
</ul>
</p>
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