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 Cot

 http://functions.wolfram.com/01.09.03.0043.01

 Input Form

 Cot[(4 Pi)/7] == (I (-1 + (-1)^(1/7)))/(1 + (-1)^(1/7))

 Standard Form

 Cell[BoxData[RowBox[List[RowBox[List["Cot", "[", FractionBox[RowBox[List["4", " ", "\[Pi]"]], "7"], "]"]], "\[Equal]", FractionBox[RowBox[List["\[ImaginaryI]", " ", RowBox[List["(", RowBox[List[RowBox[List["-", "1"]], "+", SuperscriptBox[RowBox[List["(", RowBox[List["-", "1"]], ")"]], RowBox[List["1", "/", "7"]]]]], ")"]]]], RowBox[List["1", "+", SuperscriptBox[RowBox[List["(", RowBox[List["-", "1"]], ")"]], RowBox[List["1", "/", "7"]]]]]]]]]]

 MathML Form

 cot ( 4 π 7 ) ( - 1 + - 1 7 ) 1 + - 1 7 4 7 -1 -1 -1 1 7 1 -1 1 7 -1 [/itex]

 Rule Form

 Cell[BoxData[RowBox[List[RowBox[List["HoldPattern", "[", RowBox[List["Cot", "[", FractionBox[RowBox[List["4", " ", "\[Pi]"]], "7"], "]"]], "]"]], "\[RuleDelayed]", FractionBox[RowBox[List["\[ImaginaryI]", " ", RowBox[List["(", RowBox[List[RowBox[List["-", "1"]], "+", SuperscriptBox[RowBox[List["(", RowBox[List["-", "1"]], ")"]], RowBox[List["1", "/", "7"]]]]], ")"]]]], RowBox[List["1", "+", SuperscriptBox[RowBox[List["(", RowBox[List["-", "1"]], ")"]], RowBox[List["1", "/", "7"]]]]]]]]]]

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

 2001-10-29