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<B>JACOBIDN</B> _ _ _  _ _ _  _ _ _  _ _ _ <B>operator</B><P>
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The <em>Jacobidn</em> operator returns the Jacobi Elliptic function dn. 
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syntax: </H3>
<em>Jacobidn</em>(&lt;expression&gt;,&lt;integer&gt;) 
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examples: </H3>
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Jacobidn(15, 0.683) 

  0.640574162024592 


Jacobidn(0,0) 

  1 

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