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  <refentry id="function.asin">
   <refnamediv>
    <refname>asin</refname>
    <refpurpose>Arc sine</refpurpose>
   </refnamediv>
   <refsect1>
    <title>Description</title>
     <methodsynopsis>
      <type>float</type><methodname>asin</methodname>
      <methodparam><type>float</type><parameter>arg</parameter></methodparam>
     </methodsynopsis>
    <para>
     Returns the arc sine of <parameter>arg</parameter> in radians.
     <function>asin</function> is the complementary function of
     <function>sin</function>, which means that
     <literal>a==sin(asin(a))</literal> for every value of a that is within
     <function>asin</function>'s range.
    </para>
    <para>
     See also <function>asinh</function>, <function>acos</function>
     and <function>atan</function>.
    </para>
   </refsect1>
  </refentry>

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