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 Tan

 http://functions.wolfram.com/01.08.06.0015.01

 Input Form

 Tan[z] \[Proportional] I /; (z -> E^(I \[Phi]) Infinity) && 0 < \[Phi] < Pi

 Standard Form

 Cell[BoxData[RowBox[List[RowBox[List[RowBox[List["Tan", "[", "z", "]"]], "\[Proportional]", "\[ImaginaryI]"]], "/;", " ", RowBox[List[RowBox[List["(", RowBox[List["z", "\[Rule]", RowBox[List[SuperscriptBox["\[ExponentialE]", RowBox[List["\[ImaginaryI]", " ", "\[Phi]"]]], " ", "\[Infinity]"]]]], ")"]], "\[And]", RowBox[List["0", "<", "\[Phi]", "<", "\[Pi]"]]]]]]]]

 MathML Form

 tan ( z ) /; ( z "\[Rule]" ϕ ) 0 < ϕ < π Condition Proportional z Rule z ϕ 0 ϕ [/itex]

 Rule Form

 Cell[BoxData[RowBox[List[RowBox[List["HoldPattern", "[", RowBox[List["Tan", "[", "z_", "]"]], "]"]], "\[RuleDelayed]", RowBox[List["\[ImaginaryI]", "/;", RowBox[List[RowBox[List["(", RowBox[List["z", "\[Rule]", RowBox[List[SuperscriptBox["\[ExponentialE]", RowBox[List["\[ImaginaryI]", " ", "\[Phi]"]]], " ", "\[Infinity]"]]]], ")"]], "&&", RowBox[List["0", "<", "\[Phi]", "<", "\[Pi]"]]]]]]]]]]

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

 2001-10-29