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 Csch

 http://functions.wolfram.com/01.23.03.0152.01

 Input Form

 Csch[(13 Pi I)/7] == -((2 (-1)^(1/7))/(-1 + (-1)^(2/7)))

 Standard Form

 Cell[BoxData[RowBox[List[RowBox[List["Csch", "[", FractionBox[RowBox[List["13", "\[Pi]", " ", "\[ImaginaryI]"]], "7"], "]"]], "\[Equal]", RowBox[List["-", FractionBox[RowBox[List["2", " ", SuperscriptBox[RowBox[List["(", RowBox[List["-", "1"]], ")"]], RowBox[List["1", "/", "7"]]]]], RowBox[List[RowBox[List["-", "1"]], "+", SuperscriptBox[RowBox[List["(", RowBox[List["-", "1"]], ")"]], RowBox[List["2", "/", "7"]]]]]]]]]]]]

 MathML Form

 csch ( 13 π 7 ) - 2 - 1 7 - 1 + ( - 1 ) 2 / 7 13 7 -1 -1 2 -1 1 7 -1 -1 2 7 -1 [/itex]

 Rule Form

 Cell[BoxData[RowBox[List[RowBox[List["HoldPattern", "[", RowBox[List["Csch", "[", FractionBox[RowBox[List["13", " ", "\[Pi]", " ", "\[ImaginaryI]"]], "7"], "]"]], "]"]], "\[RuleDelayed]", RowBox[List["-", FractionBox[RowBox[List["2", " ", SuperscriptBox[RowBox[List["(", RowBox[List["-", "1"]], ")"]], RowBox[List["1", "/", "7"]]]]], RowBox[List[RowBox[List["-", "1"]], "+", SuperscriptBox[RowBox[List["(", RowBox[List["-", "1"]], ")"]], RowBox[List["2", "/", "7"]]]]]]]]]]]]

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

 2001-10-29