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<title>Hyperbolic Trigonometric Functions - GNU Scientific Library -- Reference Manual</title>
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<h4 class="subsection">7.31.3 Hyperbolic Trigonometric Functions</h4>
<div class="defun">
— Function: double <b>gsl_sf_lnsinh</b> (<var>double x</var>)<var><a name="index-gsl_005fsf_005flnsinh-808"></a></var><br>
— Function: int <b>gsl_sf_lnsinh_e</b> (<var>double x, gsl_sf_result * result</var>)<var><a name="index-gsl_005fsf_005flnsinh_005fe-809"></a></var><br>
<blockquote><p><a name="index-logarithm-of-sinh-function_002c-special-functions-810"></a>These routines compute \log(\sinh(x)) for x > 0.
<!-- Domain: x > 0 -->
<!-- Exceptional Return Values: GSL_EDOM -->
</p></blockquote></div>
<div class="defun">
— Function: double <b>gsl_sf_lncosh</b> (<var>double x</var>)<var><a name="index-gsl_005fsf_005flncosh-811"></a></var><br>
— Function: int <b>gsl_sf_lncosh_e</b> (<var>double x, gsl_sf_result * result</var>)<var><a name="index-gsl_005fsf_005flncosh_005fe-812"></a></var><br>
<blockquote><p><a name="index-logarithm-of-cosh-function_002c-special-functions-813"></a>These routines compute \log(\cosh(x)) for any <var>x</var>.
<!-- Exceptional Return Values: none -->
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