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 Cosh

 http://functions.wolfram.com/01.20.03.0116.01

 Input Form

 Cosh[(13 Pi I)/9] == (-(1/2)) (-1)^(4/9) (1 - (-1)^(1/9))

 Standard Form

 Cell[BoxData[RowBox[List[RowBox[List["Cosh", "[", FractionBox[RowBox[List["13", "\[Pi]", " ", "\[ImaginaryI]"]], "9"], "]"]], "\[Equal]", RowBox[List[RowBox[List["-", FractionBox["1", "2"]]], " ", SuperscriptBox[RowBox[List["(", RowBox[List["-", "1"]], ")"]], RowBox[List["4", "/", "9"]]], " ", RowBox[List["(", RowBox[List["1", "-", SuperscriptBox[RowBox[List["(", RowBox[List["-", "1"]], ")"]], RowBox[List["1", "/", "9"]]]]], ")"]]]]]]]]

 MathML Form

 cosh ( 13 π 9 ) - 1 2 ( - 1 ) 4 / 9 ( 1 - - 1 9 ) 13 9 -1 -1 1 2 -1 4 9 1 -1 -1 1 9 [/itex]

 Rule Form

 Cell[BoxData[RowBox[List[RowBox[List["HoldPattern", "[", RowBox[List["Cosh", "[", FractionBox[RowBox[List["13", " ", "\[Pi]", " ", "\[ImaginaryI]"]], "9"], "]"]], "]"]], "\[RuleDelayed]", RowBox[List[RowBox[List["-", FractionBox["1", "2"]]], " ", SuperscriptBox[RowBox[List["(", RowBox[List["-", "1"]], ")"]], RowBox[List["4", "/", "9"]]], " ", RowBox[List["(", RowBox[List["1", "-", SuperscriptBox[RowBox[List["(", RowBox[List["-", "1"]], ")"]], RowBox[List["1", "/", "9"]]]]], ")"]]]]]]]]

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

 2001-10-29

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