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<p>The math module defines extension functions to perform mathematical operations, such as <code>pi</code>, <code>asin</code> and <code>acos</code>. All functions are preceded by the <code>math:</code> prefix. Some of the functions have also been specified in the <a href="[http://www.w3.org/TR/xpath-functions-11/">Functions and Operators Specification</a> ] of the upcoming XQuery 1.1 Recommendation.</p>
<h2>math:pi</h2>