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<B>GAMMA</B> _ _ _  _ _ _  _ _ _  _ _ _ <B>operator</B><P>
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The <em>Gamma</em> operator returns the Gamma function. 
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syntax: </H3>
<em>Gamma</em>(&lt;expression&gt;) 
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examples: </H3>
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gamma(10); 

  362880    


gamma(1/2); 

  sqrt(pi)

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