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 Cot

 http://functions.wolfram.com/01.09.10.0003.01

 Input Form

 Cot[z] == 1/z - z/(3 - z^2/(5 - z^2/(7 - z^2/(9 - z^2/(11 - \[Ellipsis])))))

 Standard Form

 Cell[BoxData[RowBox[List[RowBox[List["Cot", "[", "z", "]"]], "\[Equal]", RowBox[List[FractionBox["1", "z"], "-", FractionBox[RowBox[List[" ", "z"]], RowBox[List["3", "-", FractionBox[SuperscriptBox["z", "2"], RowBox[List["5", "-", FractionBox[SuperscriptBox["z", "2"], RowBox[List["7", "-", FractionBox[SuperscriptBox["z", "2"], RowBox[List["9", "-", FractionBox[SuperscriptBox["z", "2"], RowBox[List["11", "-", "\[Ellipsis]"]]]]]]]]]]]]]]]]]]]]]

 MathML Form

 cot ( z ) 1 z - z 3 - z 2 5 - z 2 7 - z 2 9 - z 2 11 - z 1 z -1 -1 z 3 -1 z 2 5 -1 z 2 7 -1 z 2 9 -1 z 2 11 -1 -1 -1 -1 -1 -1 [/itex]

 Rule Form

 Cell[BoxData[RowBox[List[RowBox[List["HoldPattern", "[", RowBox[List["Cot", "[", "z_", "]"]], "]"]], "\[RuleDelayed]", RowBox[List[FractionBox["1", "z"], "-", FractionBox["z", RowBox[List["3", "-", FractionBox[SuperscriptBox["z", "2"], RowBox[List["5", "-", FractionBox[SuperscriptBox["z", "2"], RowBox[List["7", "-", FractionBox[SuperscriptBox["z", "2"], RowBox[List["9", "-", FractionBox[SuperscriptBox["z", "2"], RowBox[List["11", "-", "\[Ellipsis]"]]]]]]]]]]]]]]]]]]]]]

 Contributed by

 Andreas Lauschke (2006)

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

 2007-05-02