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<a name="asinh_002c-asinhf_002d_002d_002dinverse-hyperbolic-sine"></a>
<h3 class="section">1.6 <code>asinh</code>, <code>asinhf</code>&mdash;inverse hyperbolic sine</h3>
<a name="index-asinh"></a>
<a name="index-asinhf"></a>
<p><strong>Synopsis</strong>
</p><div class="example">
<pre class="example">#include &lt;math.h&gt;
double asinh(double <var>x</var>);
float asinhf(float <var>x</var>);

</pre></div>
<p><strong>Description</strong><br>
<code>asinh</code> calculates the inverse hyperbolic sine of <var>x</var>.
<code>asinh</code> is defined as 
</p><div class="smallexample">
<pre class="smallexample"> sgn(<var>x</var>) * log(abs(<var>x</var>) + sqrt(1+<var>x</var>*<var>x</var>))
</pre></div>

<p><code>asinhf</code> is identical, other than taking and returning floats.
</p>
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<p><strong>Returns</strong><br>
<code>asinh</code> and <code>asinhf</code> return the calculated value.
</p>
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<p><strong>Portability</strong><br>
Neither <code>asinh</code> nor <code>asinhf</code> are ANSI C.
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