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   http://functions.wolfram.com/01.22.16.0034.01
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    Coth[a - I b] == (Sinh[2 a] + I Sin[2 b])/(Cosh[2 a] - Cos[2 b]) 
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   Cell[BoxData[RowBox[List[RowBox[List["Coth", "[", RowBox[List["a", "-", RowBox[List["\[ImaginaryI]", " ", "b"]]]], "]"]], "\[Equal]", FractionBox[RowBox[List[RowBox[List["Sinh", "[", RowBox[List["2", " ", "a"]], "]"]], "+", RowBox[List["\[ImaginaryI]", " ", RowBox[List["Sin", "[", RowBox[List["2", " ", "b"]], "]"]]]]]], RowBox[List[RowBox[List["Cosh", "[", RowBox[List["2", " ", "a"]], "]"]], "-", RowBox[List["Cos", "[", RowBox[List["2", " ", "b"]], "]"]]]]]]]]] 
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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> coth </mi>  <mo> ⁡ </mo>  <mo> ( </mo>  <mrow>  <mi> a </mi>  <mo> - </mo>  <mrow>  <mi> ⅈ </mi>  <mo> ⁢ </mo>  <mi> b </mi>  </mrow>  </mrow>  <mo> ) </mo>  </mrow>  <mo> ⩵ </mo>  <mfrac>  <mrow>  <mrow>  <mi> ⅈ </mi>  <mo> ⁢ </mo>  <mrow>  <mi> sin </mi>  <mo> ⁡ </mo>  <mo> ( </mo>  <mrow>  <mn> 2 </mn>  <mo> ⁢ </mo>  <mi> b </mi>  </mrow>  <mo> ) </mo>  </mrow>  </mrow>  <mo> + </mo>  <mrow>  <mi> sinh </mi>  <mo> ⁡ </mo>  <mo> ( </mo>  <mrow>  <mn> 2 </mn>  <mo> ⁢ </mo>  <mi> a </mi>  </mrow>  <mo> ) </mo>  </mrow>  </mrow>  <mrow>  <mrow>  <mi> cosh </mi>  <mo> ⁡ </mo>  <mo> ( </mo>  <mrow>  <mn> 2 </mn>  <mo> ⁢ </mo>  <mi> a </mi>  </mrow>  <mo> ) </mo>  </mrow>  <mo> - </mo>  <mrow>  <mi> cos </mi>  <mo> ⁡ </mo>  <mo> ( </mo>  <mrow>  <mn> 2 </mn>  <mo> ⁢ </mo>  <mi> b </mi>  </mrow>  <mo> ) </mo>  </mrow>  </mrow>  </mfrac>  </mrow>  <annotation-xml encoding='MathML-Content'>  <apply>  <eq />  <apply>  <coth />  <apply>  <plus />  <ci> a </ci>  <apply>  <times />  <cn type='integer'> -1 </cn>  <apply>  <times />  <imaginaryi />  <ci> b </ci>  </apply>  </apply>  </apply>  </apply>  <apply>  <times />  <apply>  <plus />  <apply>  <times />  <imaginaryi />  <apply>  <sin />  <apply>  <times />  <cn type='integer'> 2 </cn>  <ci> b </ci>  </apply>  </apply>  </apply>  <apply>  <sinh />  <apply>  <times />  <cn type='integer'> 2 </cn>  <ci> a </ci>  </apply>  </apply>  </apply>  <apply>  <power />  <apply>  <plus />  <apply>  <cosh />  <apply>  <times />  <cn type='integer'> 2 </cn>  <ci> a </ci>  </apply>  </apply>  <apply>  <times />  <cn type='integer'> -1 </cn>  <apply>  <cos />  <apply>  <times />  <cn type='integer'> 2 </cn>  <ci> b </ci>  </apply>  </apply>  </apply>  </apply>  <cn type='integer'> -1 </cn>  </apply>  </apply>  </apply>  </annotation-xml>  </semantics>  </math> 
   
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  | Cell[BoxData[RowBox[List[RowBox[List["HoldPattern", "[", RowBox[List["Coth", "[", RowBox[List["a_", "-", RowBox[List["\[ImaginaryI]", " ", "b_"]]]], "]"]], "]"]], "\[RuleDelayed]", FractionBox[RowBox[List[RowBox[List["Sinh", "[", RowBox[List["2", " ", "a"]], "]"]], "+", RowBox[List["\[ImaginaryI]", " ", RowBox[List["Sin", "[", RowBox[List["2", " ", "b"]], "]"]]]]]], RowBox[List[RowBox[List["Cosh", "[", RowBox[List["2", " ", "a"]], "]"]], "-", RowBox[List["Cos", "[", RowBox[List["2", " ", "b"]], "]"]]]]]]]]]  |  
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   Date Added to functions.wolfram.com (modification date)
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