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   http://functions.wolfram.com/09.28.16.0003.01
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    JacobiDC[I z, 1 - m] == JacobiDN[z, m] 
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   Cell[BoxData[RowBox[List[RowBox[List["JacobiDC", "[", RowBox[List[RowBox[List["\[ImaginaryI]", " ", "z"]], ",", RowBox[List["1", "-", "m"]]]], "]"]], "\[Equal]", RowBox[List["JacobiDN", "[", RowBox[List["z", ",", "m"]], "]"]]]]]] 
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   <math xmlns='http://www.w3.org/1998/Math/MathML' mathematica:form='TraditionalForm' xmlns:mathematica='http://www.wolfram.com/XML/'>  <semantics>  <mrow>  <mrow>  <mi> dc </mi>  <mo> ⁡ </mo>  <mo> ( </mo>  <mrow>  <mrow>  <mi> ⅈ </mi>  <mo> ⁢ </mo>  <mi> z </mi>  </mrow>  <mo> ❘ </mo>  <mrow>  <mn> 1 </mn>  <mo> - </mo>  <mi> m </mi>  </mrow>  </mrow>  <mo> ) </mo>  </mrow>  <mo> ⩵ </mo>  <mrow>  <mi> dn </mi>  <mo> ⁡ </mo>  <mo> ( </mo>  <mrow>  <mi> z </mi>  <mo> ❘ </mo>  <mi> m </mi>  </mrow>  <mo> ) </mo>  </mrow>  </mrow>  <annotation-xml encoding='MathML-Content'>  <apply>  <eq />  <apply>  <ci> JacobiDC </ci>  <apply>  <times />  <imaginaryi />  <ci> z </ci>  </apply>  <apply>  <plus />  <cn type='integer'> 1 </cn>  <apply>  <times />  <cn type='integer'> -1 </cn>  <ci> m </ci>  </apply>  </apply>  </apply>  <apply>  <ci> JacobiDN </ci>  <ci> z </ci>  <ci> m </ci>  </apply>  </apply>  </annotation-xml>  </semantics>  </math> 
   
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  | Cell[BoxData[RowBox[List[RowBox[List["HoldPattern", "[", RowBox[List["JacobiDC", "[", RowBox[List[RowBox[List["\[ImaginaryI]", " ", "z_"]], ",", RowBox[List["1", "-", "m_"]]]], "]"]], "]"]], "\[RuleDelayed]", RowBox[List["JacobiDN", "[", RowBox[List["z", ",", "m"]], "]"]]]]]]  |  
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   Date Added to functions.wolfram.com (modification date)
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