>
<br/>
<span class="normal">Link with</span> -lsleefquad -ltlfloat.
</p>

<p class="header">Description</p>

<p class="noindent">
  These functions evaluate the inverse hyperbolic cosine function of a value
  in <i class="var">a</i>. The error bound of the returned value is
  1.0 ULP.
</p>

<hr/>

<p class="funcname"><b id="Sleef_atanhq1_u10" class="func">Sleef_atanhq1_u10</b>, <b id="Sleef_atanhq1_u10purec" class="func">Sleef_atanhq1_u10purec</b>, <b id="Sleef_atanhq1_u10purecfma" class="func">Sleef_atanh