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<p><code>real</code> <strong><code>binomial_coefficient_log</code></strong><code>(real x, real y)</code><br>
<em><strong>Warning:</strong></em> This function is deprecated and should be replaced with
<code>lchoose</code>. Return the natural logarithm of the binomial coefficient of
x and y. For non-negative integer inputs, the binomial coefficient
function is written as <span class="math inline">\(\binom{x}{y}\)</span> and pronounced “x choose y.”
This function generalizes to real numbers us