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 Tan

 http://functions.wolfram.com/01.08.27.0056.01

 Input Form

 Tan[z] == Sqrt[1 - Cosh[I z]^2]/Cosh[I z] /; 0 < Re[z] < Pi

 Standard Form

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

 MathML Form

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

 Rule Form

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

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

 2001-10-29