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<B>NUM</B> _ _ _  _ _ _  _ _ _  _ _ _ <B>operator</B><P>
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The <em>num</em> operator returns the numerator of its argument. 
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syntax: </H3>
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<em>num</em>(&lt;expression&gt;) or <em>num</em> &lt;simple\_expression&gt; 
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&lt;expression&gt; can be any valid REDUCE scalar expression. 
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examples: </H3>
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num(100/6); 

  50 


num(a/5 + b/6); 

  6*A + 5*B 


num(sin(x)); 

  SIN(X)

</TT></PRE><P><em>num</em>returns the numerator of the expression after it has b
een simplified 
by REDUCE. As seen in the examples, this includes putting sums of rational 
expressions over a common denominator, and reducing common factors where 
possible. If the expression is not a rational expression, it is returned 
unchanged. 
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