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 Tan

 http://functions.wolfram.com/01.08.03.0033.01

 Input Form

 Tan[(3 Pi)/7] == -((I (-1 + (-1)^(6/7)))/(1 + (-1)^(6/7)))

 Standard Form

 Cell[BoxData[RowBox[List[RowBox[List["Tan", "[", FractionBox[RowBox[List["3", " ", "\[Pi]"]], "7"], "]"]], "\[Equal]", RowBox[List["-", FractionBox[RowBox[List["\[ImaginaryI]", " ", RowBox[List["(", RowBox[List[RowBox[List["-", "1"]], "+", SuperscriptBox[RowBox[List["(", RowBox[List["-", "1"]], ")"]], RowBox[List["6", "/", "7"]]]]], ")"]]]], RowBox[List["1", "+", SuperscriptBox[RowBox[List["(", RowBox[List["-", "1"]], ")"]], RowBox[List["6", "/", "7"]]]]]]]]]]]]

 MathML Form

 tan ( 3 π 7 ) - ( - 1 + ( - 1 ) 6 / 7 ) 1 + ( - 1 ) 6 / 7 3 7 -1 -1 -1 -1 6 7 1 -1 6 7 -1 [/itex]

 Rule Form

 Cell[BoxData[RowBox[List[RowBox[List["HoldPattern", "[", RowBox[List["Tan", "[", FractionBox[RowBox[List["3", " ", "\[Pi]"]], "7"], "]"]], "]"]], "\[RuleDelayed]", RowBox[List["-", FractionBox[RowBox[List["\[ImaginaryI]", " ", RowBox[List["(", RowBox[List[RowBox[List["-", "1"]], "+", SuperscriptBox[RowBox[List["(", RowBox[List["-", "1"]], ")"]], RowBox[List["6", "/", "7"]]]]], ")"]]]], RowBox[List["1", "+", SuperscriptBox[RowBox[List["(", RowBox[List["-", "1"]], ")"]], RowBox[List["6", "/", "7"]]]]]]]]]]]]

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

 2001-10-29