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<A NAME=SECH>

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



<B>SECH</B> _ _ _  _ _ _  _ _ _  _ _ _ <B>operator</B><P>
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The <em>sech</em> operator returns the hyperbolic secant of its argument. 
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 <P> <H3> 
syntax: </H3>
<em>sech</em>(&lt;expression&gt;) or <em>sech</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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 <P> <H3> 
examples: </H3>
<P><PRE><TT>
sech abc; 

  SECH(ABC) 



sech(0); 

  1 



sech 4; 

  SECH(4) 



on rounded; 


sech(4); 

  0.0366189934737 



sech log 5; 

  0.384615384615

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