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<A NAME=SEC>

<TITLE>SEC</TITLE></A>
<b><a href=r37_idx.html>INDEX</a></b><p><p>



<B>SEC</B> _ _ _  _ _ _  _ _ _  _ _ _ <B>operator</B><P>
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The <em>sec</em> operator returns the secant of its argument. 
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syntax: </H3>
<em>sec</em>(&lt;expression&gt;) or <em>sec</em> &lt;simple\_expression&gt; 
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&lt;expression&gt; is any valid scalar REDUCE expression, 
&lt;simple\_expression&gt; is a single identifier or begins with a prefix 
operator name. 
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examples: </H3>
<P><PRE><TT>


sec abc; 

  SEC(ABC) 



sec(pi); 

  -1 



sec 4; 

  SEC(4) 



on rounded; 


sec(4); 

  - 1.52988565647 



sec log 5; 

  - 25.8852966005

</TT></PRE><P><em>sec</em>returns a numeric value only if 
<A HREF=r37_0330.html>rounded</A> is on. Then the 
secant is calculated to the current degree of floating point precision. 
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