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<A NAME=COSH>

<TITLE>COSH</TITLE></A>
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<B>COSH</B> _ _ _  _ _ _  _ _ _  _ _ _ <B>operator</B><P>
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The <em>cosh</em> operator returns the hyperbolic cosine of its argument. 
The derivative of <em>cosh</em> and some simple transformations are known 
to the system. 
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syntax: </H3>
<em>cosh</em>(&lt;expression&gt;) or <em>cosh</em> &lt;simple\_expression&gt; 
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&lt;expression&gt; may be any scalar REDUCE expression, not an array, matrix or 

vector expression. &lt;simple\_expression&gt; must be a single identifier or 
begin with a prefix operator name. 
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examples: </H3>
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cosh b; 

  COSH(B) 



cosh(0); 

  1 



df(cosh(x*y),x); 

  SINH(X*Y)*Y 



int(cosh(x),x); 

  SINH(X)

</TT></PRE><P>You may attach further functionality by defining its inverse (see 


<A HREF=r37_0237.html>acosh</A>). 
A numeric value is not returned by <em>cosh</em> unless the switch 

<A HREF=r37_0330.html>rounded</A> is on and its argument evaluates to a number. 

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