<function>cotd</function> ( <type>double precision</type> )
        <returnvalue>double precision</returnvalue>
       </para>
       <para>
        Cotangent, argument in degrees
       </para>
       <para>
        <literal>cotd(45)</literal>
        <returnvalue>1</returnvalue>
       </para></entry>
      </row>

      <row>
       <entry role="func_table_entry"><para role="func_signature">
        <indexterm>
         <primary>sin</primary>
        </indexterm>
        <function>sin</function> ( <type>double precision</type> )
        <returnvalue>double precision</returnvalue>
       </para>
       <para>
        Sine, argument in radians
       </para>
       <para>
        <literal>sin(1)</literal>
        <returnvalue>0.8414709848078965</returnvalue>
       </para></entry>
      </row>

      <row>
       <entry role="func_table_entry"><para role="func_signature">
        <indexterm>
         <primary>sind</primary>
        </indexterm>
        <function>sind</function> ( <type>double precision</type> )
        <returnvalue>double precision</returnvalue>
       </para>
       <para>
        Sine, argument in degrees
       </para>
       <para>
        <literal>sind(30)</literal>
        <returnvalue>0.5</returnvalue>
       </para></entry>
      </row>

      <row>
       <entry role="func_table_entry"><para role="func_signature">
        <indexterm>
         <primary>tan</primary>
        </indexterm>
        <function>tan</function> ( <type>double precision</type> )
        <returnvalue>double precision</returnvalue>
       </para>
       <para>
        Tangent, argument in radians
       </para>
       <para>
        <literal>tan(1)</literal>
        <returnvalue>1.5574077246549023</returnvalue>
       </para></entry>
      </row>

      <row>
       <entry role="func_table_entry"><para role="func_signature">
        <indexterm>
         <primary>tand</primary>
        </indexterm>
        <function>tand</function> ( <type>double precision</type> )
        <returnvalue>double precision</returnvalue>
       </para>
       <para>
        Tangent, argument in degrees
       </para>
       <para>
        <literal>tand(45)</literal>
        <returnvalue>1</returnvalue>
       </para></entry>
      </row>
     </tbody>
    </tgroup>
   </table>

  <note>
   <para>
    Another way to work with angles measured in degrees is to use the unit
    transformation functions <literal><function>radians()</function></literal>
    and <literal><function>degrees()</function></literal> shown earlier.
    However, using the degree-based trigonometric functions is preferred,
    as that way avoids round-off error for special cases such
    as <literal>sind(30)</literal>.
   </para>
  </note>

  <para>
   <xref linkend="functions-math-hyp-table"/> shows the
   available hyperbolic functions.
  </para>

  <table id="functions-math-hyp-table">
    <title>Hyperbolic Functions</title>

    <tgroup cols="1">
     <thead>
      <row>
       <entry role="func_table_entry"><para role="func_signature">
        Function
       </para>
       <para>
        Description
       </para>
       <para>
        Example(s)
       </para></entry>
      </row>
     </thead>

     <tbody>
      <row>
       <entry role="func_table_entry"><para role="func_signature">
        <indexterm>
         <primary>sinh</primary>
        </indexterm>
        <function>sinh</function> ( <type>double precision</type> )
        <returnvalue>double precision</returnvalue>
       </para>
       <para>
        Hyperbolic sine
       </para>
       <para>
        <literal>sinh(1)</literal>
        <returnvalue>1.1752011936438014</returnvalue>
       </para></entry>
      </row>

      <row>
       <entry role="func_table_entry"><para role="func_signature">
        <indexterm>
         <primary>cosh</primary>
        </indexterm>
        <function>cosh</function> ( <type>double precision</type> )
        <returnvalue>double precision</returnvalue>
       </para>
       <para>