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 Cosh

 http://functions.wolfram.com/01.20.03.0101.01

 Input Form

 Cosh[(9 Pi I)/7] == (-(1/2)) (-1)^(2/7) (1 - (-1)^(3/7))

 Standard Form

 Cell[BoxData[RowBox[List[RowBox[List["Cosh", "[", FractionBox[RowBox[List["9", "\[Pi]", " ", "\[ImaginaryI]"]], "7"], "]"]], "\[Equal]", RowBox[List[RowBox[List["-", FractionBox["1", "2"]]], " ", SuperscriptBox[RowBox[List["(", RowBox[List["-", "1"]], ")"]], RowBox[List["2", "/", "7"]]], " ", RowBox[List["(", RowBox[List["1", "-", SuperscriptBox[RowBox[List["(", RowBox[List["-", "1"]], ")"]], RowBox[List["3", "/", "7"]]]]], ")"]]]]]]]]

 MathML Form

 cosh ( 9 π 7 ) - 1 2 ( - 1 ) 2 / 7 ( 1 - ( - 1 ) 3 / 7 ) 9 7 -1 -1 1 2 -1 2 7 1 -1 -1 3 7 [/itex]

 Rule Form

 Cell[BoxData[RowBox[List[RowBox[List["HoldPattern", "[", RowBox[List["Cosh", "[", FractionBox[RowBox[List["9", " ", "\[Pi]", " ", "\[ImaginaryI]"]], "7"], "]"]], "]"]], "\[RuleDelayed]", RowBox[List[RowBox[List["-", FractionBox["1", "2"]]], " ", SuperscriptBox[RowBox[List["(", RowBox[List["-", "1"]], ")"]], RowBox[List["2", "/", "7"]]], " ", RowBox[List["(", RowBox[List["1", "-", SuperscriptBox[RowBox[List["(", RowBox[List["-", "1"]], ")"]], RowBox[List["3", "/", "7"]]]]], ")"]]]]]]]]

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

 2001-10-29