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 CosIntegral

 http://functions.wolfram.com/06.38.06.0017.01

 Input Form

 CosIntegral[z] \[Proportional] Log[z] + EulerGamma - (z^2/4) (1 - z^2/24 + z^4/1080 - O[z^6])

 Standard Form

 Cell[BoxData[RowBox[List[RowBox[List["CosIntegral", "[", "z", "]"]], "\[Proportional]", RowBox[List[RowBox[List["Log", "[", "z", "]"]], "+", "EulerGamma", "-", RowBox[List[FractionBox[SuperscriptBox["z", "2"], "4"], " ", RowBox[List["(", RowBox[List["1", "-", FractionBox[SuperscriptBox["z", "2"], "24"], "+", FractionBox[SuperscriptBox["z", "4"], "1080"], "-", RowBox[List["O", "[", SuperscriptBox["z", "6"], "]"]]]], ")"]]]]]]]]]]

 MathML Form

 Ci ( z ) log ( z ) + TagBox["\[DoubledGamma]", Function[EulerGamma]] - 1 4 z 2 ( 1 - z 2 24 + z 4 1080 - O ( z 6 ) ) Proportional CosIntegral z z -1 1 4 z 2 1 -1 z 2 24 -1 z 4 1080 -1 -1 O z 6 [/itex]

 Rule Form

 Cell[BoxData[RowBox[List[RowBox[List["HoldPattern", "[", RowBox[List["CosIntegral", "[", "z_", "]"]], "]"]], "\[RuleDelayed]", RowBox[List[RowBox[List["Log", "[", "z", "]"]], "+", "EulerGamma", "-", RowBox[List[FractionBox["1", "4"], " ", SuperscriptBox["z", "2"], " ", RowBox[List["(", RowBox[List["1", "-", FractionBox[SuperscriptBox["z", "2"], "24"], "+", FractionBox[SuperscriptBox["z", "4"], "1080"], "-", SuperscriptBox[RowBox[List["O", "[", "z", "]"]], "6"]]], ")"]]]]]]]]]]

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

 2007-05-02