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   http://functions.wolfram.com/09.30.27.0067.01
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    JacobiDS[z, m] == -(JacobiDC[z, m]/((JacobiCN[z, m] - JacobiNC[z, m]) 
    JacobiNS[z, m])) 
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   Cell[BoxData[RowBox[List[RowBox[List["JacobiDS", "[", RowBox[List["z", ",", "m"]], "]"]], "\[Equal]", RowBox[List["-", FractionBox[RowBox[List["JacobiDC", "[", RowBox[List["z", ",", "m"]], "]"]], RowBox[List[RowBox[List["(", RowBox[List[RowBox[List["JacobiCN", "[", RowBox[List["z", ",", "m"]], "]"]], "-", RowBox[List["JacobiNC", "[", RowBox[List["z", ",", "m"]], "]"]]]], ")"]], " ", RowBox[List["JacobiNS", "[", 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> ds </mi>  <mo> ⁡ </mo>  <mo> ( </mo>  <mrow>  <mi> z </mi>  <mo> ❘ </mo>  <mi> m </mi>  </mrow>  <mo> ) </mo>  </mrow>  <mo>  </mo>  <mrow>  <mo> - </mo>  <mfrac>  <mrow>  <mi> dc </mi>  <mo> ⁡ </mo>  <mo> ( </mo>  <mrow>  <mi> z </mi>  <mo> ❘ </mo>  <mi> m </mi>  </mrow>  <mo> ) </mo>  </mrow>  <mrow>  <mrow>  <mo> ( </mo>  <mrow>  <mrow>  <mi> cn </mi>  <mo> ⁡ </mo>  <mo> ( </mo>  <mrow>  <mi> z </mi>  <mo> ❘ </mo>  <mi> m </mi>  </mrow>  <mo> ) </mo>  </mrow>  <mo> - </mo>  <mrow>  <mi> nc </mi>  <mo> ⁡ </mo>  <mo> ( </mo>  <mrow>  <mi> z </mi>  <mo> ❘ </mo>  <mi> m </mi>  </mrow>  <mo> ) </mo>  </mrow>  </mrow>  <mo> ) </mo>  </mrow>  <mo> ⁢ </mo>  <mrow>  <mi> ns </mi>  <mo> ⁡ </mo>  <mo> ( </mo>  <mrow>  <mi> z </mi>  <mo> ❘ </mo>  <mi> m </mi>  </mrow>  <mo> ) </mo>  </mrow>  </mrow>  </mfrac>  </mrow>  </mrow>  <annotation-xml encoding='MathML-Content'>  <apply>  <eq />  <apply>  <ci> JacobiDS </ci>  <ci> z </ci>  <ci> m </ci>  </apply>  <apply>  <times />  <cn type='integer'> -1 </cn>  <apply>  <times />  <apply>  <ci> JacobiDC </ci>  <ci> z </ci>  <ci> m </ci>  </apply>  <apply>  <power />  <apply>  <times />  <apply>  <plus />  <apply>  <ci> JacobiCN </ci>  <ci> z </ci>  <ci> m </ci>  </apply>  <apply>  <times />  <cn type='integer'> -1 </cn>  <apply>  <ci> JacobiNC </ci>  <ci> z </ci>  <ci> m </ci>  </apply>  </apply>  </apply>  <apply>  <ci> JacobiNS </ci>  <ci> z </ci>  <ci> m </ci>  </apply>  </apply>  <cn type='integer'> -1 </cn>  </apply>  </apply>  </apply>  </apply>  </annotation-xml>  </semantics>  </math> 
   
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  | Cell[BoxData[RowBox[List[RowBox[List["HoldPattern", "[", RowBox[List["JacobiDS", "[", RowBox[List["z_", ",", "m_"]], "]"]], "]"]], "\[RuleDelayed]", RowBox[List["-", FractionBox[RowBox[List["JacobiDC", "[", RowBox[List["z", ",", "m"]], "]"]], RowBox[List[RowBox[List["(", RowBox[List[RowBox[List["JacobiCN", "[", RowBox[List["z", ",", "m"]], "]"]], "-", RowBox[List["JacobiNC", "[", RowBox[List["z", ",", "m"]], "]"]]]], ")"]], " ", RowBox[List["JacobiNS", "[", RowBox[List["z", ",", "m"]], "]"]]]]]]]]]]]  |  
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   Date Added to functions.wolfram.com (modification date)
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