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 Cosh

 http://functions.wolfram.com/01.20.03.0146.01

 Input Form

 Cosh[(15 Pi I)/8] == Root[1 - 8 #1^2 + 8 #1^4 & , 4]

 Standard Form

 Cell[BoxData[RowBox[List[RowBox[List["Cosh", "[", FractionBox[RowBox[List["15", "\[Pi]", " ", "\[ImaginaryI]"]], "8"], "]"]], "\[Equal]", RowBox[List["Root", "[", RowBox[List[RowBox[List[RowBox[List["1", "-", RowBox[List["8", " ", SuperscriptBox["#1", "2"]]], "+", RowBox[List["8", " ", SuperscriptBox["#1", "4"]]]]], "&"]], ",", "4"]], "]"]]]]]]

 MathML Form

 cosh ( 15 π 8 ) ( z ; 8 z 4 - 8 z 2 + 1 ) 4 - 1 15 8 -1 Subscript CompoundExpression z 8 z 4 -1 8 z 2 1 4 -1 [/itex]

 Rule Form

 Cell[BoxData[RowBox[List[RowBox[List["HoldPattern", "[", RowBox[List["Cosh", "[", FractionBox[RowBox[List["15", " ", "\[Pi]", " ", "\[ImaginaryI]"]], "8"], "]"]], "]"]], "\[RuleDelayed]", RowBox[List["Root", "[", RowBox[List[RowBox[List[RowBox[List["1", "-", RowBox[List["8", " ", SuperscriptBox["#1", "2"]]], "+", RowBox[List["8", " ", SuperscriptBox["#1", "4"]]]]], "&"]], ",", "4"]], "]"]]]]]]

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

 2001-10-29