kind</code></strong><code>(int v, real x)</code><br>
Return the Bessel function of the second kind with order v applied to
x defined for positive x and v. For <span class="math inline">\(x,v &gt; 0\)</span>, <span class="math display">\[
\mathrm{bessel\_second\_kind}(v,x) = \begin{cases} Y_v(x) &amp; \text{if }
x &gt; 0 \\ \textrm{error} &amp; \text{otherwise} \end{cases} \]</span> where <span class="math display">\[
Y_v(x)=\frac{J_v(x)\cos(v\pi)-J_{-v}(x)}{\sin(v\pi)} \]</span></p>
<!-- real; modified_bess