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<chapter id="functions">

<title>Functions and Operators</title>

Finally, <xref linkend="functions-math-trig-table"> shows the

available trigonometric functions. All trigonometric functions

take arguments and return values of type <type>double

precision</type>.

precision</type>. Trigonometric functions arguments are expressed

in radians. Inverse functions return values are expressed in

radians. See unit transformation functions

<literal><function>radians</function>()</literal> and

<literal><function>degrees</function>()</literal> above.

</para>

<indexterm>

<table id="functions-math-trig-table">

<title>Trigonometric Functions</title>

<tgroup cols="2">

<tgroup cols="3">

<thead>

<row>

<entry>Function</entry>