code></strong><code>(T x)</code><br>
inverse hyperbolic cosine (in radians)</p>
<!-- R; asinh; (T x); -->
<p></p>
<p><code>R</code> <strong><code>asinh</code></strong><code>(T x)</code><br>
inverse hyperbolic cosine (in radians)</p>
<!-- R; atanh; (T x); -->
<p></p>
<p><code>R</code> <strong><code>atanh</code></strong><code>(T x)</code><br>
inverse hyperbolic tangent (in radians) of x</p>
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