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 Cot

 http://functions.wolfram.com/01.09.03.0022.01

 Input Form

 Cot[(2 Pi)/7] == Root[-1 + 21 #1^2 - 35 #1^4 + 7 #1^6 & , 5]

 Standard Form

 Cell[BoxData[RowBox[List[RowBox[List["Cot", "[", FractionBox[RowBox[List["2", " ", "\[Pi]"]], "7"], "]"]], "\[Equal]", RowBox[List["Root", "[", RowBox[List[RowBox[List[RowBox[List[RowBox[List["-", "1"]], "+", RowBox[List["21", " ", SuperscriptBox["#1", "2"]]], "-", RowBox[List["35", " ", SuperscriptBox["#1", "4"]]], "+", RowBox[List["7", " ", SuperscriptBox["#1", "6"]]]]], "&"]], ",", "5"]], "]"]]]]]]

 MathML Form

 cot ( 2 π 7 ) ( z ; 7 z 6 - 35 z 4 + 21 z 2 - 1 ) 5 - 1 2 7 -1 Subscript CompoundExpression z 7 z 6 -1 35 z 4 21 z 2 -1 5 -1 [/itex]

 Rule Form

 Cell[BoxData[RowBox[List[RowBox[List["HoldPattern", "[", RowBox[List["Cot", "[", FractionBox[RowBox[List["2", " ", "\[Pi]"]], "7"], "]"]], "]"]], "\[RuleDelayed]", RowBox[List["Root", "[", RowBox[List[RowBox[List[RowBox[List[RowBox[List["-", "1"]], "+", RowBox[List["21", " ", SuperscriptBox["#1", "2"]]], "-", RowBox[List["35", " ", SuperscriptBox["#1", "4"]]], "+", RowBox[List["7", " ", SuperscriptBox["#1", "6"]]]]], "&"]], ",", "5"]], "]"]]]]]]

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

 2001-10-29