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 Cos

 http://functions.wolfram.com/01.07.03.0058.01

 Input Form

 Cos[(5 Pi)/7] == Root[1 - 4 #1 - 4 #1^2 + 8 #1^3 & , 1]

 Standard Form

 Cell[BoxData[RowBox[List[RowBox[List["Cos", "[", FractionBox[RowBox[List["5", " ", "\[Pi]"]], "7"], "]"]], "\[Equal]", RowBox[List["Root", "[", RowBox[List[RowBox[List[RowBox[List["1", "-", RowBox[List["4", " ", "#1"]], "-", RowBox[List["4", " ", SuperscriptBox["#1", "2"]]], "+", RowBox[List["8", " ", SuperscriptBox["#1", "3"]]]]], "&"]], ",", "1"]], "]"]]]]]]

 MathML Form

 cos ( 5 π 7 ) ( z ; 8 z 3 - 4 z 2 - 4 z + 1 ) 1 - 1 5 7 -1 Subscript CompoundExpression z 8 z 3 -1 4 z 2 -1 4 z 1 1 -1 [/itex]

 Rule Form

 Cell[BoxData[RowBox[List[RowBox[List["HoldPattern", "[", RowBox[List["Cos", "[", FractionBox[RowBox[List["5", " ", "\[Pi]"]], "7"], "]"]], "]"]], "\[RuleDelayed]", RowBox[List["Root", "[", RowBox[List[RowBox[List[RowBox[List["1", "-", RowBox[List["4", " ", "#1"]], "-", RowBox[List["4", " ", SuperscriptBox["#1", "2"]]], "+", RowBox[List["8", " ", SuperscriptBox["#1", "3"]]]]], "&"]], ",", "1"]], "]"]]]]]]

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

 2001-10-29