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 Tan

 http://functions.wolfram.com/01.08.03.0008.01

 Input Form

 Tan[Pi/9] == Root[-3 + 27 #1^2 - 33 #1^4 + #1^6 & , 4]

 Standard Form

 Cell[BoxData[RowBox[List[RowBox[List["Tan", "[", FractionBox["\[Pi]", "9"], "]"]], "\[Equal]", RowBox[List["Root", "[", RowBox[List[RowBox[List[RowBox[List[RowBox[List["-", "3"]], "+", RowBox[List["27", " ", SuperscriptBox["#1", "2"]]], "-", RowBox[List["33", " ", SuperscriptBox["#1", "4"]]], "+", SuperscriptBox["#1", "6"]]], "&"]], ",", "4"]], "]"]]]]]]

 MathML Form

 tan ( π 9 ) ( z ; z 6 - 33 z 4 + 27 z 2 - 3 ) 4 - 1 9 -1 Subscript CompoundExpression z z 6 -1 33 z 4 27 z 2 -3 4 -1 [/itex]

 Rule Form

 Cell[BoxData[RowBox[List[RowBox[List["HoldPattern", "[", RowBox[List["Tan", "[", FractionBox["\[Pi]", "9"], "]"]], "]"]], "\[RuleDelayed]", RowBox[List["Root", "[", RowBox[List[RowBox[List[RowBox[List[RowBox[List["-", "3"]], "+", RowBox[List["27", " ", SuperscriptBox["#1", "2"]]], "-", RowBox[List["33", " ", SuperscriptBox["#1", "4"]]], "+", SuperscriptBox["#1", "6"]]], "&"]], ",", "4"]], "]"]]]]]]

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

 2001-10-29