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 Coth

 http://functions.wolfram.com/01.22.16.0064.01

 Input Form

 Coth[ArcSin[z]] == 1/(-1 + 2/(1 + (I z + Sqrt[1 - z^2])^(2 I)))

 Standard Form

 Cell[BoxData[RowBox[List[RowBox[List["Coth", "[", RowBox[List["ArcSin", "[", "z", "]"]], "]"]], "\[Equal]", FractionBox["1", RowBox[List[RowBox[List["-", "1"]], "+", FractionBox["2", RowBox[List["1", "+", SuperscriptBox[RowBox[List["(", RowBox[List[RowBox[List["\[ImaginaryI]", " ", "z"]], "+", SqrtBox[RowBox[List["1", "-", SuperscriptBox["z", "2"]]]]]], ")"]], RowBox[List["2", " ", "\[ImaginaryI]"]]]]]]]]]]]]]

 MathML Form

 coth ( sin - 1 ( z ) ) 1 2 ( z + 1 - z 2 ) 2 + 1 - 1 z 1 2 z 1 -1 z 2 1 2 2 1 -1 -1 -1 [/itex]

 Rule Form

 Cell[BoxData[RowBox[List[RowBox[List["HoldPattern", "[", RowBox[List["Coth", "[", RowBox[List["ArcSin", "[", "z_", "]"]], "]"]], "]"]], "\[RuleDelayed]", FractionBox["1", RowBox[List[RowBox[List["-", "1"]], "+", FractionBox["2", RowBox[List["1", "+", SuperscriptBox[RowBox[List["(", RowBox[List[RowBox[List["\[ImaginaryI]", " ", "z"]], "+", SqrtBox[RowBox[List["1", "-", SuperscriptBox["z", "2"]]]]]], ")"]], RowBox[List["2", " ", "\[ImaginaryI]"]]]]]]]]]]]]]

 Date Added to functions.wolfram.com (modification date)

 2007-05-02