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<h4>evaluate</h4>
<pre>public static&nbsp;double&nbsp;evaluate(java.lang.String&nbsp;expr,
              java.util.HashMap&nbsp;symbols)
                       throws java.lang.Exception</pre>
<div class="block">Parses and evaluates the given expression.
 Returns the result of the mathematical expression, based on the given 
 values of the symbols.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>expr</code> - the expressio