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 Tan

 http://functions.wolfram.com/01.08.27.0009.01

 Input Form

 Tan[z] == (-(Sqrt[-z^2]/z)) (Sin[z]/Sqrt[Sin[z]^2 - 1]) /; 0 < Re[z] < Pi

 Standard Form

 Cell[BoxData[RowBox[List[RowBox[List[RowBox[List["Tan", "[", "z", "]"]], "\[Equal]", RowBox[List[RowBox[List["-", FractionBox[RowBox[List[SqrtBox[RowBox[List["-", SuperscriptBox["z", "2"]]]], " "]], RowBox[List["z", " "]]]]], FractionBox[RowBox[List["Sin", "[", "z", "]"]], SqrtBox[RowBox[List[SuperscriptBox[RowBox[List["Sin", "[", "z", "]"]], "2"], "-", "1"]]]]]]]], "/;", RowBox[List["0", "<", RowBox[List["Re", "[", "z", "]"]], "<", "\[Pi]"]]]]]]

 MathML Form

 tan ( z ) - - z 2 z sin ( z ) sin 2 ( z ) - 1 /; 0 < Re ( z ) < π Condition z -1 -1 z 2 1 2 z -1 z z 2 -1 1 2 -1 0 z [/itex]

 Rule Form

 Cell[BoxData[RowBox[List[RowBox[List["HoldPattern", "[", RowBox[List["Tan", "[", "z_", "]"]], "]"]], "\[RuleDelayed]", RowBox[List[RowBox[List["-", FractionBox[RowBox[List[SqrtBox[RowBox[List["-", SuperscriptBox["z", "2"]]]], " ", RowBox[List["Sin", "[", "z", "]"]]]], RowBox[List["z", " ", SqrtBox[RowBox[List[SuperscriptBox[RowBox[List["Sin", "[", "z", "]"]], "2"], "-", "1"]]]]]]]], "/;", RowBox[List["0", "<", RowBox[List["Re", "[", "z", "]"]], "<", "\[Pi]"]]]]]]]]

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

 2001-10-29