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Next: <a href="Conversion-Functions.html#Conversion-Functions" accesskey="n" rel="next">Conversion Functions</a>, Previous: <a href="Trigonometric-Functions-for-Complex-Arguments.html#Trigonometric-Functions-for-Complex-Arguments" accesskey="p" rel="previous">Trigonometric Functions for Complex Arguments</a>, Up: <a href="Trigonometric-Functions.html#Trigonometric-Functions" accesskey="u" rel="up">Trigonometric Functions</a> &nbsp; [<a href="Function-Index.html#Function-Index" title="Index" rel="index">Index</a>]</p>
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<a name="Hyperbolic-Trigonometric-Functions-1"></a>
<h4 class="subsection">7.31.3 Hyperbolic Trigonometric Functions</h4>

<dl>
<dt><a name="index-gsl_005fsf_005flnsinh"></a>Function: <em>double</em> <strong>gsl_sf_lnsinh</strong> <em>(double <var>x</var>)</em></dt>
<dt><a name="index-gsl_005fsf_005flnsinh_005fe"></a>Function: <em>int</em> <strong>gsl_sf_lnsinh_e</strong> <em>(double <var>x</var>, gsl_sf_result * <var>result</var>)</em></dt>
<dd><a name="index-logarithm-of-sinh-function_002c-special-functions"></a>
<p>These routines compute <em>\log(\sinh(x))</em> for <em>x &gt; 0</em>.
</p></dd></dl>

<dl>
<dt><a name="index-gsl_005fsf_005flncosh"></a>Function: <em>double</em> <strong>gsl_sf_lncosh</strong> <em>(double <var>x</var>)</em></dt>
<dt><a name="index-gsl_005fsf_005flncosh_005fe"></a>Function: <em>int</em> <strong>gsl_sf_lncosh_e</strong> <em>(double <var>x</var>, gsl_sf_result * <var>result</var>)</em></dt>
<dd><a name="index-logarithm-of-cosh-function_002c-special-functions"></a>
<p>These routines compute <em>\log(\cosh(x))</em> for any <var>x</var>.
</p></dd></dl>





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