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+<title>Basics (The Chickadee Game Toolkit)</title>
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+Next: <a href="Vectors.html#Vectors" accesskey="n" rel="next">Vectors</a>, Up: <a href="Math.html#Math" accesskey="u" rel="up">Math</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Index.html#Index" title="Index" rel="index">Index</a>]</p>
+</div>
+<hr>
+<a name="Basics-1"></a>
+<h4 class="subsection">2.2.1 Basics</h4>
+
+<dl>
+<dt><a name="index-pi"></a>Variable: <strong>pi</strong></dt>
+<dd><p>An essential constant for all trigonometry. <code>&#x03C0;</code> is the ratio
+of a circle&rsquo;s circumferences to its diameter. Since <code>&#x03C0;</code> is an
+irrational number, the <var>pi</var> in Chickadee is a mere floating point
+approximation that is &ldquo;good enough.&rdquo;
+</p></dd></dl>
+
+<dl>
+<dt><a name="index-pi_002f2"></a>Variable: <strong>pi/2</strong></dt>
+<dd><p>Half of <var>pi</var>.
+</p></dd></dl>
+
+<dl>
+<dt><a name="index-cotan"></a>Procedure: <strong>cotan</strong> <em><var>z</var></em></dt>
+<dd><p>Return the cotangent of <var>z</var>.
+</p></dd></dl>
+
+
+
+
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