<p>Arc tangent.
    Result is in radians and is between <code class="code">-pi/2</code> and <code class="code">pi/2</code>.</p>
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<pre><span id="VALatan2"><span class="keyword">val</span> atan2</span> : <code class="type">float -&gt; float -&gt; float</code></pre><div class="info ">
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<p><code class="code">atan2&nbsp;y&nbsp;x</code> returns the arc tangent of <code class="code">y&nbsp;/.&nbsp;x</code>.  The signs of <code class="code">x</code>
    and <code class="code">y<