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   http://functions.wolfram.com/09.34.19.0005.01
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    Conjugate[JacobiSC[x + I y, m]] == (JacobiSN[x, m] JacobiDN[y, 1 - m] - 
    I JacobiCN[x, m] JacobiDN[x, m] JacobiCN[y, 1 - m] JacobiSN[y, 1 - m])/
   (JacobiCN[x, m] JacobiCN[y, 1 - m] + I JacobiSN[x, m] JacobiDN[x, m] 
     JacobiSN[y, 1 - m] JacobiDN[y, 1 - m]) /; Element[{x, y, m}, Reals] 
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   Cell[BoxData[RowBox[List[RowBox[List[RowBox[List["Conjugate", "[", RowBox[List["JacobiSC", "[", RowBox[List[RowBox[List["x", "+", RowBox[List["\[ImaginaryI]", " ", "y"]]]], ",", "m"]], "]"]], "]"]], "\[Equal]", RowBox[List[RowBox[List["(", RowBox[List[RowBox[List[RowBox[List["JacobiSN", "[", RowBox[List["x", ",", "m"]], "]"]], " ", RowBox[List["JacobiDN", "[", RowBox[List["y", ",", RowBox[List["1", "-", "m"]]]], "]"]]]], "-", RowBox[List["\[ImaginaryI]", " ", RowBox[List["JacobiCN", "[", RowBox[List["x", ",", "m"]], "]"]], " ", RowBox[List["JacobiDN", "[", RowBox[List["x", ",", "m"]], "]"]], " ", RowBox[List["JacobiCN", "[", RowBox[List["y", ",", RowBox[List["1", "-", "m"]]]], "]"]], " ", RowBox[List["JacobiSN", "[", RowBox[List["y", ",", RowBox[List["1", "-", "m"]]]], "]"]]]]]], ")"]], "/", RowBox[List["(", RowBox[List[RowBox[List[RowBox[List["JacobiCN", "[", RowBox[List["x", ",", "m"]], "]"]], " ", RowBox[List["JacobiCN", "[", RowBox[List["y", ",", RowBox[List["1", "-", "m"]]]], "]"]]]], "+", RowBox[List["\[ImaginaryI]", " ", RowBox[List["JacobiSN", "[", RowBox[List["x", ",", "m"]], "]"]], " ", RowBox[List["JacobiDN", "[", RowBox[List["x", ",", "m"]], "]"]], " ", RowBox[List["JacobiSN", "[", RowBox[List["y", ",", RowBox[List["1", "-", "m"]]]], "]"]], " ", RowBox[List["JacobiDN", "[", RowBox[List["y", ",", RowBox[List["1", "-", "m"]]]], "]"]]]]]], ")"]]]]]], "/;", RowBox[List[RowBox[List["{", RowBox[List["x", ",", "y", ",", "m"]], "}"]], "\[Element]", "Reals"]]]]]] 
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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>  <mover>  <mrow>  <mi> sc </mi>  <mo> ⁡ </mo>  <mo> ( </mo>  <mrow>  <mrow>  <mi> x </mi>  <mo> + </mo>  <mrow>  <mi> ⅈ </mi>  <mo> ⁢ </mo>  <mi> y </mi>  </mrow>  </mrow>  <mo> ❘ </mo>  <mi> m </mi>  </mrow>  <mo> ) </mo>  </mrow>  <mo> _ </mo>  </mover>  <mo> ⩵ </mo>  <mfrac>  <mrow>  <mrow>  <mrow>  <mi> dn </mi>  <mo> ⁡ </mo>  <mo> ( </mo>  <mrow>  <mi> y </mi>  <mo> ❘ </mo>  <mrow>  <mn> 1 </mn>  <mo> - </mo>  <mi> m </mi>  </mrow>  </mrow>  <mo> ) </mo>  </mrow>  <mo> ⁢ </mo>  <mrow>  <mi> sn </mi>  <mo> ⁡ </mo>  <mo> ( </mo>  <mrow>  <mi> x </mi>  <mo> ❘ </mo>  <mi> m </mi>  </mrow>  <mo> ) </mo>  </mrow>  </mrow>  <mo> - </mo>  <mrow>  <mi> ⅈ </mi>  <mo> ⁢ </mo>  <mrow>  <mi> cn </mi>  <mo> ⁡ </mo>  <mo> ( </mo>  <mrow>  <mi> x </mi>  <mo> ❘ </mo>  <mi> m </mi>  </mrow>  <mo> ) </mo>  </mrow>  <mo> ⁢ </mo>  <mrow>  <mi> cn </mi>  <mo> ⁡ </mo>  <mo> ( </mo>  <mrow>  <mi> y </mi>  <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> x </mi>  <mo> ❘ </mo>  <mi> m </mi>  </mrow>  <mo> ) </mo>  </mrow>  <mo> ⁢ </mo>  <mrow>  <mi> sn </mi>  <mo> ⁡ </mo>  <mo> ( </mo>  <mrow>  <mi> y </mi>  <mo> ❘ </mo>  <mrow>  <mn> 1 </mn>  <mo> - </mo>  <mi> m </mi>  </mrow>  </mrow>  <mo> ) </mo>  </mrow>  </mrow>  </mrow>  <mrow>  <mrow>  <mrow>  <mi> cn </mi>  <mo> ⁡ </mo>  <mo> ( </mo>  <mrow>  <mi> x </mi>  <mo> ❘ </mo>  <mi> m </mi>  </mrow>  <mo> ) </mo>  </mrow>  <mo> ⁢ </mo>  <mrow>  <mi> cn </mi>  <mo> ⁡ </mo>  <mo> ( </mo>  <mrow>  <mi> y </mi>  <mo> ❘ </mo>  <mrow>  <mn> 1 </mn>  <mo> - </mo>  <mi> m </mi>  </mrow>  </mrow>  <mo> ) </mo>  </mrow>  </mrow>  <mo> + </mo>  <mrow>  <mi> ⅈ </mi>  <mo> ⁢ </mo>  <mrow>  <mi> sn </mi>  <mo> ⁡ </mo>  <mo> ( </mo>  <mrow>  <mi> x </mi>  <mo> ❘ </mo>  <mi> m </mi>  </mrow>  <mo> ) </mo>  </mrow>  <mo> ⁢ </mo>  <mrow>  <mi> dn </mi>  <mo> ⁡ </mo>  <mo> ( </mo>  <mrow>  <mi> x </mi>  <mo> ❘ </mo>  <mi> m </mi>  </mrow>  <mo> ) </mo>  </mrow>  <mo> ⁢ </mo>  <mrow>  <mi> sn </mi>  <mo> ⁡ </mo>  <mo> ( </mo>  <mrow>  <mi> y </mi>  <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> y </mi>  <mo> ❘ </mo>  <mrow>  <mn> 1 </mn>  <mo> - </mo>  <mi> m </mi>  </mrow>  </mrow>  <mo> ) </mo>  </mrow>  </mrow>  </mrow>  </mfrac>  </mrow>  <mo> /; </mo>  <mrow>  <mrow>  <mo> { </mo>  <mrow>  <mi> x </mi>  <mo> , </mo>  <mi> y </mi>  <mo> , </mo>  <mi> m </mi>  </mrow>  <mo> } </mo>  </mrow>  <mo> ∈ </mo>  <semantics>  <mi> ℝ </mi>  <annotation encoding='Mathematica'> TagBox["\[DoubleStruckCapitalR]", Function[List[], Reals]] </annotation>  </semantics>  </mrow>  </mrow>  <annotation-xml encoding='MathML-Content'>  <apply>  <ci> Condition </ci>  <apply>  <eq />  <apply>  <ci> OverBar </ci>  <apply>  <ci> JacobiSC </ci>  <apply>  <plus />  <ci> x </ci>  <apply>  <times />  <imaginaryi />  <ci> y </ci>  </apply>  </apply>  <ci> m </ci>  </apply>  </apply>  <apply>  <times />  <apply>  <plus />  <apply>  <times />  <apply>  <ci> JacobiDN </ci>  <ci> y </ci>  <apply>  <plus />  <cn type='integer'> 1 </cn>  <apply>  <times />  <cn type='integer'> -1 </cn>  <ci> m </ci>  </apply>  </apply>  </apply>  <apply>  <ci> JacobiSN </ci>  <ci> x </ci>  <ci> m </ci>  </apply>  </apply>  <apply>  <times />  <cn type='integer'> -1 </cn>  <apply>  <times />  <imaginaryi />  <apply>  <ci> JacobiCN </ci>  <ci> x </ci>  <ci> m </ci>  </apply>  <apply>  <ci> JacobiCN </ci>  <ci> y </ci>  <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> x </ci>  <ci> m </ci>  </apply>  <apply>  <ci> JacobiSN </ci>  <ci> y </ci>  <apply>  <plus />  <cn type='integer'> 1 </cn>  <apply>  <times />  <cn type='integer'> -1 </cn>  <ci> m </ci>  </apply>  </apply>  </apply>  </apply>  </apply>  </apply>  <apply>  <power />  <apply>  <plus />  <apply>  <times />  <apply>  <ci> JacobiCN </ci>  <ci> x </ci>  <ci> m </ci>  </apply>  <apply>  <ci> JacobiCN </ci>  <ci> y </ci>  <apply>  <plus />  <cn type='integer'> 1 </cn>  <apply>  <times />  <cn type='integer'> -1 </cn>  <ci> m </ci>  </apply>  </apply>  </apply>  </apply>  <apply>  <times />  <imaginaryi />  <apply>  <ci> JacobiSN </ci>  <ci> x </ci>  <ci> m </ci>  </apply>  <apply>  <ci> JacobiDN </ci>  <ci> x </ci>  <ci> m </ci>  </apply>  <apply>  <ci> JacobiSN </ci>  <ci> y </ci>  <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> y </ci>  <apply>  <plus />  <cn type='integer'> 1 </cn>  <apply>  <times />  <cn type='integer'> -1 </cn>  <ci> m </ci>  </apply>  </apply>  </apply>  </apply>  </apply>  <cn type='integer'> -1 </cn>  </apply>  </apply>  </apply>  <apply>  <in />  <list>  <ci> x </ci>  <ci> y </ci>  <ci> m </ci>  </list>  <reals />  </apply>  </apply>  </annotation-xml>  </semantics>  </math> 
   
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  | Cell[BoxData[RowBox[List[RowBox[List["HoldPattern", "[", RowBox[List["Conjugate", "[", RowBox[List["JacobiSC", "[", RowBox[List[RowBox[List["x_", "+", RowBox[List["\[ImaginaryI]", " ", "y_"]]]], ",", "m_"]], "]"]], "]"]], "]"]], "\[RuleDelayed]", RowBox[List[FractionBox[RowBox[List[RowBox[List[RowBox[List["JacobiSN", "[", RowBox[List["x", ",", "m"]], "]"]], " ", RowBox[List["JacobiDN", "[", RowBox[List["y", ",", RowBox[List["1", "-", "m"]]]], "]"]]]], "-", RowBox[List["\[ImaginaryI]", " ", RowBox[List["JacobiCN", "[", RowBox[List["x", ",", "m"]], "]"]], " ", RowBox[List["JacobiDN", "[", RowBox[List["x", ",", "m"]], "]"]], " ", RowBox[List["JacobiCN", "[", RowBox[List["y", ",", RowBox[List["1", "-", "m"]]]], "]"]], " ", RowBox[List["JacobiSN", "[", RowBox[List["y", ",", RowBox[List["1", "-", "m"]]]], "]"]]]]]], RowBox[List[RowBox[List[RowBox[List["JacobiCN", "[", RowBox[List["x", ",", "m"]], "]"]], " ", RowBox[List["JacobiCN", "[", RowBox[List["y", ",", RowBox[List["1", "-", "m"]]]], "]"]]]], "+", RowBox[List["\[ImaginaryI]", " ", RowBox[List["JacobiSN", "[", RowBox[List["x", ",", "m"]], "]"]], " ", RowBox[List["JacobiDN", "[", RowBox[List["x", ",", "m"]], "]"]], " ", RowBox[List["JacobiSN", "[", RowBox[List["y", ",", RowBox[List["1", "-", "m"]]]], "]"]], " ", RowBox[List["JacobiDN", "[", RowBox[List["y", ",", RowBox[List["1", "-", "m"]]]], "]"]]]]]]], "/;", RowBox[List[RowBox[List["{", RowBox[List["x", ",", "y", ",", "m"]], "}"]], "\[Element]", "Reals"]]]]]]]]  |  
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   Date Added to functions.wolfram.com (modification date)
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