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 Tan

 http://functions.wolfram.com/01.08.27.0016.01

 Input Form

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

 Standard Form

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

 MathML Form

 tan ( z ) z 2 z 1 - cos 2 ( z ) cos ( z ) /; "\[LeftBracketingBar]" Re ( z ) "\[RightBracketingBar]" < π Condition z z 2 1 2 z -1 1 -1 z 2 1 2 z -1 z [/itex]

 Rule Form

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

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

 2001-10-29

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