t><dd class="col-md-8"> hyperbolic cosine function</dd>
<dt class="col-md-4"> <samp>debug(</samp><var>x</var><samp>)</samp></dt><dd class="col-md-8"> print <var>x</var> (useful for debugging your expression)</dd>
<dt class="col-md-4"> <samp>do(</samp><var>statements</var>, <var>condition</var><samp>)</samp></dt><dd class="col-md-8"> iterate while the condition is not equal to 0</dd>
<dt class="col-md-4"> <samp>drc(</samp><var>x</var>,<var>y</var><samp>)</samp></dt><dd class="col-md-8"> dynamic range compres