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   http://functions.wolfram.com/09.26.27.0099.01
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    JacobiCN[z, m] == (-1 + m + JacobiDS[z, m]^2) JacobiSC[z, m] JacobiSN[z, m] 
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   Cell[BoxData[RowBox[List[RowBox[List["JacobiCN", "[", RowBox[List["z", ",", "m"]], "]"]], "\[Equal]", RowBox[List[RowBox[List["(", RowBox[List[RowBox[List["-", "1"]], "+", "m", "+", SuperscriptBox[RowBox[List["JacobiDS", "[", RowBox[List["z", ",", "m"]], "]"]], "2"]]], ")"]], " ", RowBox[List["JacobiSC", "[", RowBox[List["z", ",", "m"]], "]"]], " ", RowBox[List["JacobiSN", "[", 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> cn </mi>  <mo> ⁡ </mo>  <mo> ( </mo>  <mrow>  <mi> z </mi>  <mo> ❘ </mo>  <mi> m </mi>  </mrow>  <mo> ) </mo>  </mrow>  <mo>  </mo>  <mrow>  <mrow>  <mo> ( </mo>  <mrow>  <msup>  <mrow>  <mi> ds </mi>  <mo> ⁡ </mo>  <mo> ( </mo>  <mrow>  <mi> z </mi>  <mo> ❘ </mo>  <mi> m </mi>  </mrow>  <mo> ) </mo>  </mrow>  <mn> 2 </mn>  </msup>  <mo> + </mo>  <mi> m </mi>  <mo> - </mo>  <mn> 1 </mn>  </mrow>  <mo> ) </mo>  </mrow>  <mo> ⁢ </mo>  <mrow>  <mi> sc </mi>  <mo> ⁡ </mo>  <mo> ( </mo>  <mrow>  <mi> z </mi>  <mo> ❘ </mo>  <mi> m </mi>  </mrow>  <mo> ) </mo>  </mrow>  <mo> ⁢ </mo>  <mrow>  <mi> sn </mi>  <mo> ⁡ </mo>  <mo> ( </mo>  <mrow>  <mi> z </mi>  <mo> ❘ </mo>  <mi> m </mi>  </mrow>  <mo> ) </mo>  </mrow>  </mrow>  </mrow>  <annotation-xml encoding='MathML-Content'>  <apply>  <eq />  <apply>  <ci> JacobiCN </ci>  <ci> z </ci>  <ci> m </ci>  </apply>  <apply>  <times />  <apply>  <plus />  <apply>  <power />  <apply>  <ci> JacobiDS </ci>  <ci> z </ci>  <ci> m </ci>  </apply>  <cn type='integer'> 2 </cn>  </apply>  <ci> m </ci>  <cn type='integer'> -1 </cn>  </apply>  <apply>  <ci> JacobiSC </ci>  <ci> z </ci>  <ci> m </ci>  </apply>  <apply>  <ci> JacobiSN </ci>  <ci> z </ci>  <ci> m </ci>  </apply>  </apply>  </apply>  </annotation-xml>  </semantics>  </math> 
   
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  | Cell[BoxData[RowBox[List[RowBox[List["HoldPattern", "[", RowBox[List["JacobiCN", "[", RowBox[List["z_", ",", "m_"]], "]"]], "]"]], "\[RuleDelayed]", RowBox[List[RowBox[List["(", RowBox[List[RowBox[List["-", "1"]], "+", "m", "+", SuperscriptBox[RowBox[List["JacobiDS", "[", RowBox[List["z", ",", "m"]], "]"]], "2"]]], ")"]], " ", RowBox[List["JacobiSC", "[", RowBox[List["z", ",", "m"]], "]"]], " ", RowBox[List["JacobiSN", "[", RowBox[List["z", ",", "m"]], "]"]]]]]]]]  |  
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   Date Added to functions.wolfram.com (modification date)
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