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 Sec

 http://functions.wolfram.com/01.11.06.0001.02

 Input Form

 Sec[z] \[Proportional] 1 + z^2/2 + (5 z^4)/24 + (61 z^6)/720 + \[Ellipsis] /; (z -> 0)

 Standard Form

 Cell[BoxData[RowBox[List[RowBox[List[RowBox[List["Sec", "[", "z", "]"]], "\[Proportional]", RowBox[List["1", "+", FractionBox[SuperscriptBox["z", "2"], "2"], "+", FractionBox[RowBox[List["5", " ", SuperscriptBox["z", "4"]]], "24"], "+", FractionBox[RowBox[List["61", " ", SuperscriptBox["z", "6"]]], "720"], "+", "\[Ellipsis]"]]]], "/;", RowBox[List["(", RowBox[List["z", "\[Rule]", "0"]], ")"]]]]]]

 MathML Form

 sec ( z ) 1 + z 2 2 + 5 z 4 24 + 61 z 6 720 + /; ( z "\[Rule]" 0 ) Condition Proportional z 1 z 2 2 -1 5 z 4 24 -1 61 z 6 720 -1 Rule z 0 [/itex]

 Rule Form

 Cell[BoxData[RowBox[List[RowBox[List["HoldPattern", "[", RowBox[List["Sec", "[", "z_", "]"]], "]"]], "\[RuleDelayed]", RowBox[List[RowBox[List["1", "+", FractionBox[SuperscriptBox["z", "2"], "2"], "+", FractionBox[RowBox[List["5", " ", SuperscriptBox["z", "4"]]], "24"], "+", FractionBox[RowBox[List["61", " ", SuperscriptBox["z", "6"]]], "720"], "+", "\[Ellipsis]"]], "/;", RowBox[List["(", RowBox[List["z", "\[Rule]", "0"]], ")"]]]]]]]]

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

 2001-10-29