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3 | 3 | <chapter id="functions"> |
4 | 4 | <title>Functions and Operators</title> |
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910 | 910 | Finally, <xref linkend="functions-math-trig-table"> shows the |
911 | 911 | available trigonometric functions. All trigonometric functions |
912 | 912 | take arguments and return values of type <type>double |
913 | | - precision</type>. |
| 913 | + precision</type>. Trigonometric functions arguments are expressed |
| 914 | + in radians. Inverse functions return values are expressed in |
| 915 | + radians. See unit transformation functions |
| 916 | + <literal><function>radians</function>()</literal> and |
| 917 | + <literal><function>degrees</function>()</literal> above. |
914 | 918 | </para> |
915 | 919 |
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916 | 920 | <indexterm> |
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941 | 945 | <table id="functions-math-trig-table"> |
942 | 946 | <title>Trigonometric Functions</title> |
943 | 947 |
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944 | | - <tgroup cols="2"> |
| 948 | + <tgroup cols="3"> |
945 | 949 | <thead> |
946 | 950 | <row> |
947 | 951 | <entry>Function</entry> |
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