reference/math/functions/atan.xml
abed9056c54488744908309aefc6265f56329dca
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</refnamediv>
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<refsect1 role="description">
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&reftitle.description;
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<methodsynopsis>
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<type>float</type><methodname>atan</methodname>
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<methodparam><type>float</type><parameter>arg</parameter></methodparam>
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</methodsynopsis>
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<methodsynopsis>
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<type>float</type><methodname>atan</methodname>
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<methodparam><type>float</type><parameter>num</parameter></methodparam>
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</methodsynopsis>
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<para>
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Returns the arc tangent of <parameter>arg</parameter> in radians.
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<function>atan</function> is the complementary function of
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Returns the arc tangent of <parameter>num</parameter> in radians.
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<function>atan</function> is the inverse function of
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<function>tan</function>, which means that
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<literal>a==tan(atan(a))</literal> for every value of a that is within
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<function>atan</function>'s range.
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<code>$num == tan(atan($num))</code> for every value of
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<parameter>num</parameter> that is in
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the domain of <function>atan</function>.
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</para>
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</refsect1>
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<refsect1 role="parameters">
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<para>
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<variablelist>
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<varlistentry>
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<term><parameter>arg</parameter></term>
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<term><parameter>num</parameter></term>
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<listitem>
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<para>
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The argument to process
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<refsect1 role="returnvalues">
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&reftitle.returnvalues;
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<para>
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The arc tangent of <parameter>arg</parameter> in radians.
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The arc tangent of <parameter>num</parameter> in radians.
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</para>
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</refsect1>
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<refsect1 role="seealso">
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</para>
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</refsect1>
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</refentry>
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<!-- Keep this comment at the end of the file
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Local variables:
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mode: sgml
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