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   http://functions.wolfram.com/06.33.19.0004.01
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    Im[FresnelC[x + I y]] == Sum[(((-1)^k 2^(2 k) Pi^(2 k - 1/2) x^(4 k + 1))/
    (4 k + 1)!) Gamma[1/2 + 2 k] (1 + y^2/x^2)^(1/2 + 2 k) 
   Sin[(4 k + 1) ArcTan[y/x]], {k, 0, Infinity}] 
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   Cell[BoxData[RowBox[List[RowBox[List["Im", "[", RowBox[List["FresnelC", "[", RowBox[List["x", "+", RowBox[List["\[ImaginaryI]", " ", "y"]]]], "]"]], "]"]], "\[Equal]", "  ", RowBox[List[UnderoverscriptBox["\[Sum]", RowBox[List["k", "=", "0"]], "\[Infinity]"], RowBox[List[FractionBox[RowBox[List[SuperscriptBox[RowBox[List["(", RowBox[List["-", "1"]], ")"]], "k"], " ", SuperscriptBox["2", RowBox[List["2", " ", "k"]]], " ", SuperscriptBox["\[Pi]", RowBox[List[RowBox[List["2", "k"]], "-", FractionBox["1", "2"]]]], " ", SuperscriptBox["x", RowBox[List[RowBox[List["4", " ", "k"]], "+", "1"]]]]], RowBox[List[RowBox[List["(", RowBox[List[RowBox[List["4", "k"]], "+", "1"]], ")"]], "!"]]], " ", RowBox[List["Gamma", "[", RowBox[List[FractionBox["1", "2"], "+", RowBox[List["2", " ", "k"]]]], "]"]], " ", SuperscriptBox[RowBox[List["(", RowBox[List["1", "+", FractionBox[SuperscriptBox["y", "2"], SuperscriptBox["x", "2"]]]], ")"]], RowBox[List[FractionBox["1", "2"], "+", RowBox[List["2", " ", "k"]]]]], RowBox[List["Sin", "[", RowBox[List[RowBox[List["(", RowBox[List[RowBox[List["4", " ", "k"]], "+", "1"]], ")"]], " ", RowBox[List["ArcTan", "[", FractionBox["y", "x"], "]"]]]], "]"]]]]]]]]]] 
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   <math xmlns='http://www.w3.org/1998/Math/MathML' mathematica:form='TraditionalForm' xmlns:mathematica='http://www.wolfram.com/XML/'>  <semantics>  <mrow>  <mrow>  <mi> Im </mi>  <mo> ⁡ </mo>  <mo> ( </mo>  <mrow>  <semantics>  <mi> C </mi>  <annotation encoding='Mathematica'> TagBox["C", FresnelC] </annotation>  </semantics>  <mo> ( </mo>  <mrow>  <mi> x </mi>  <mo> + </mo>  <mrow>  <mi> ⅈ </mi>  <mo> ⁢ </mo>  <mi> y </mi>  </mrow>  </mrow>  <mo> ) </mo>  </mrow>  <mo> ) </mo>  </mrow>  <mo> ⩵ </mo>  <mrow>  <munderover>  <mo> ∑ </mo>  <mrow>  <mi> k </mi>  <mo> = </mo>  <mn> 0 </mn>  </mrow>  <mi> ∞ </mi>  </munderover>  <mrow>  <mfrac>  <mrow>  <msup>  <mrow>  <mo> ( </mo>  <mrow>  <mo> - </mo>  <mn> 1 </mn>  </mrow>  <mo> ) </mo>  </mrow>  <mi> k </mi>  </msup>  <mo> ⁢ </mo>  <msup>  <mn> 2 </mn>  <mrow>  <mn> 2 </mn>  <mo> ⁢ </mo>  <mi> k </mi>  </mrow>  </msup>  <mo> ⁢ </mo>  <msup>  <mi> π </mi>  <mrow>  <mrow>  <mn> 2 </mn>  <mo> ⁢ </mo>  <mi> k </mi>  </mrow>  <mo> - </mo>  <mfrac>  <mn> 1 </mn>  <mn> 2 </mn>  </mfrac>  </mrow>  </msup>  <mo> ⁢ </mo>  <msup>  <mi> x </mi>  <mrow>  <mrow>  <mn> 4 </mn>  <mo> ⁢ </mo>  <mi> k </mi>  </mrow>  <mo> + </mo>  <mn> 1 </mn>  </mrow>  </msup>  </mrow>  <mrow>  <mrow>  <mo> ( </mo>  <mrow>  <mrow>  <mn> 4 </mn>  <mo> ⁢ </mo>  <mi> k </mi>  </mrow>  <mo> + </mo>  <mn> 1 </mn>  </mrow>  <mo> ) </mo>  </mrow>  <mo> ! </mo>  </mrow>  </mfrac>  <mo> ⁢ </mo>  <mrow>  <mi> Γ </mi>  <mo> ⁡ </mo>  <mo> ( </mo>  <mrow>  <mrow>  <mn> 2 </mn>  <mo> ⁢ </mo>  <mi> k </mi>  </mrow>  <mo> + </mo>  <mfrac>  <mn> 1 </mn>  <mn> 2 </mn>  </mfrac>  </mrow>  <mo> ) </mo>  </mrow>  <mo> ⁢ </mo>  <msup>  <mrow>  <mo> ( </mo>  <mrow>  <mn> 1 </mn>  <mo> + </mo>  <mfrac>  <msup>  <mi> y </mi>  <mn> 2 </mn>  </msup>  <msup>  <mi> x </mi>  <mn> 2 </mn>  </msup>  </mfrac>  </mrow>  <mo> ) </mo>  </mrow>  <mrow>  <mrow>  <mn> 2 </mn>  <mo> ⁢ </mo>  <mi> k </mi>  </mrow>  <mo> + </mo>  <mfrac>  <mn> 1 </mn>  <mn> 2 </mn>  </mfrac>  </mrow>  </msup>  <mo> ⁢ </mo>  <mrow>  <mi> sin </mi>  <mo> ⁡ </mo>  <mo> ( </mo>  <mrow>  <mrow>  <mo> ( </mo>  <mrow>  <mrow>  <mn> 4 </mn>  <mo> ⁢ </mo>  <mi> k </mi>  </mrow>  <mo> + </mo>  <mn> 1 </mn>  </mrow>  <mo> ) </mo>  </mrow>  <mo> ⁢ </mo>  <mrow>  <msup>  <mi> tan </mi>  <mrow>  <mo> - </mo>  <mn> 1 </mn>  </mrow>  </msup>  <mo> ( </mo>  <mfrac>  <mi> y </mi>  <mi> x </mi>  </mfrac>  <mo> ) </mo>  </mrow>  </mrow>  <mo> ) </mo>  </mrow>  </mrow>  </mrow>  </mrow>  <annotation-xml encoding='MathML-Content'>  <apply>  <eq />  <apply>  <imaginary />  <apply>  <ci> FresnelC </ci>  <apply>  <plus />  <ci> x </ci>  <apply>  <times />  <imaginaryi />  <ci> y </ci>  </apply>  </apply>  </apply>  </apply>  <apply>  <sum />  <bvar>  <ci> k </ci>  </bvar>  <lowlimit>  <cn type='integer'> 0 </cn>  </lowlimit>  <uplimit>  <infinity />  </uplimit>  <apply>  <times />  <apply>  <times />  <apply>  <power />  <cn type='integer'> -1 </cn>  <ci> k </ci>  </apply>  <apply>  <power />  <cn type='integer'> 2 </cn>  <apply>  <times />  <cn type='integer'> 2 </cn>  <ci> k </ci>  </apply>  </apply>  <apply>  <power />  <pi />  <apply>  <plus />  <apply>  <times />  <cn type='integer'> 2 </cn>  <ci> k </ci>  </apply>  <apply>  <times />  <cn type='integer'> -1 </cn>  <cn type='rational'> 1 <sep /> 2 </cn>  </apply>  </apply>  </apply>  <apply>  <power />  <ci> x </ci>  <apply>  <plus />  <apply>  <times />  <cn type='integer'> 4 </cn>  <ci> k </ci>  </apply>  <cn type='integer'> 1 </cn>  </apply>  </apply>  <apply>  <power />  <apply>  <factorial />  <apply>  <plus />  <apply>  <times />  <cn type='integer'> 4 </cn>  <ci> k </ci>  </apply>  <cn type='integer'> 1 </cn>  </apply>  </apply>  <cn type='integer'> -1 </cn>  </apply>  </apply>  <apply>  <ci> Gamma </ci>  <apply>  <plus />  <apply>  <times />  <cn type='integer'> 2 </cn>  <ci> k </ci>  </apply>  <cn type='rational'> 1 <sep /> 2 </cn>  </apply>  </apply>  <apply>  <power />  <apply>  <plus />  <cn type='integer'> 1 </cn>  <apply>  <times />  <apply>  <power />  <ci> y </ci>  <cn type='integer'> 2 </cn>  </apply>  <apply>  <power />  <apply>  <power />  <ci> x </ci>  <cn type='integer'> 2 </cn>  </apply>  <cn type='integer'> -1 </cn>  </apply>  </apply>  </apply>  <apply>  <plus />  <apply>  <times />  <cn type='integer'> 2 </cn>  <ci> k </ci>  </apply>  <cn type='rational'> 1 <sep /> 2 </cn>  </apply>  </apply>  <apply>  <sin />  <apply>  <times />  <apply>  <plus />  <apply>  <times />  <cn type='integer'> 4 </cn>  <ci> k </ci>  </apply>  <cn type='integer'> 1 </cn>  </apply>  <apply>  <arctan />  <apply>  <times />  <ci> y </ci>  <apply>  <power />  <ci> x </ci>  <cn type='integer'> -1 </cn>  </apply>  </apply>  </apply>  </apply>  </apply>  </apply>  </apply>  </apply>  </annotation-xml>  </semantics>  </math> 
   
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  | Cell[BoxData[RowBox[List[RowBox[List["HoldPattern", "[", RowBox[List["Im", "[", RowBox[List["FresnelC", "[", RowBox[List["x_", "+", RowBox[List["\[ImaginaryI]", " ", "y_"]]]], "]"]], "]"]], "]"]], "\[RuleDelayed]", RowBox[List[UnderoverscriptBox["\[Sum]", RowBox[List["k", "=", "0"]], "\[Infinity]"], FractionBox[RowBox[List[RowBox[List["(", RowBox[List[SuperscriptBox[RowBox[List["(", RowBox[List["-", "1"]], ")"]], "k"], " ", SuperscriptBox["2", RowBox[List["2", " ", "k"]]], " ", SuperscriptBox["\[Pi]", RowBox[List[RowBox[List["2", " ", "k"]], "-", FractionBox["1", "2"]]]], " ", SuperscriptBox["x", RowBox[List[RowBox[List["4", " ", "k"]], "+", "1"]]]]], ")"]], " ", RowBox[List["Gamma", "[", RowBox[List[FractionBox["1", "2"], "+", RowBox[List["2", " ", "k"]]]], "]"]], " ", SuperscriptBox[RowBox[List["(", RowBox[List["1", "+", FractionBox[SuperscriptBox["y", "2"], SuperscriptBox["x", "2"]]]], ")"]], RowBox[List[FractionBox["1", "2"], "+", RowBox[List["2", " ", "k"]]]]], " ", RowBox[List["Sin", "[", RowBox[List[RowBox[List["(", RowBox[List[RowBox[List["4", " ", "k"]], "+", "1"]], ")"]], " ", RowBox[List["ArcTan", "[", FractionBox["y", "x"], "]"]]]], "]"]]]], RowBox[List[RowBox[List["(", RowBox[List[RowBox[List["4", " ", "k"]], "+", "1"]], ")"]], "!"]]]]]]]]]  |  
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   Date Added to functions.wolfram.com (modification date)
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