<?xml version="1.0" encoding="utf-8"?>
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<refentry xml:id="function.tan" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>tan</refname>
  <refpurpose>Tangent</refpurpose>
 </refnamediv>
 <refsect1 role="description">
  &reftitle.description;
   <methodsynopsis>
    <type>float</type><methodname>tan</methodname>
    <methodparam><type>float</type><parameter>arg</parameter></methodparam>
   </methodsynopsis>
  <para>
   <function>tan</function> returns the tangent of the <parameter>arg</parameter>
   parameter.  The <parameter>arg</parameter> parameter is in radians.
  </para>
 </refsect1>
 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>arg</parameter></term>
     <listitem>
      <para>
       The argument to process in radians 
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>
 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   The tangent of <parameter>arg</parameter>
  </para>
 </refsect1>
 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title><function>tan</function> example</title>
    <programlisting role="php">
<![CDATA[
<?php

echo tan(M_PI_4); // 1

?>
]]>
    </programlisting>
   </example>
  </para>
 </refsect1>
 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>atan</function></member>
    <member><function>atan2</function></member>
    <member><function>sin</function></member>
    <member><function>cos</function></member>
    <member><function>tanh</function></member>
    <member><function>deg2rad</function></member>
   </simplelist>
  </para>
 </refsect1>
</refentry>

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