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<B>JACOBISN</B> _ _ _  _ _ _  _ _ _  _ _ _ <B>operator</B><P>
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The <em>Jacobisn</em> operator returns the Jacobi Elliptic function sn. 
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syntax: </H3>
<em>Jacobisn</em>(&lt;expression&gt;,&lt;integer&gt;) 
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examples: </H3>
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Jacobisn(0.672, 0.36) 

  0.609519691792 


Jacobisn(1,0.9) 

  0.770085724907881 

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