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root of <code class="inline"><span class="i">$_</span></code>
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. Only works on non-negative operands, unless you've
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loaded the standard Math::Complex module.</p>
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<a class="l_k" href="../functions/print.html">print</a> <a class="l_k" href="../functions/sqrt.html">sqrt</a><span class="s">(</span><span class="n">-2</span><span class="s">)</span><span class="sc">;</span> <span class="c"># prints 1.4142135623731i</span></pre>