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   http://functions.wolfram.com/01.03.03.0043.01
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    E^((2 Pi I)/5) == Root[1 + #1 + #1^2 + #1^3 + #1^4 & , 4] 
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   Cell[BoxData[RowBox[List[SuperscriptBox["\[ExponentialE]", FractionBox[RowBox[List["2", "\[Pi]", " ", "\[ImaginaryI]"]], "5"]], "\[Equal]", RowBox[List["Root", "[", RowBox[List[RowBox[List[RowBox[List["1", "+", "#1", "+", SuperscriptBox["#1", "2"], "+", SuperscriptBox["#1", "3"], "+", SuperscriptBox["#1", "4"]]], "&"]], ",", "4"]], "]"]]]]]] 
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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>  <msup>  <mi> ⅇ </mi>  <mfrac>  <mrow>  <mn> 2 </mn>  <mo> ⁢ </mo>  <mi> π </mi>  <mo> ⁢ </mo>  <mi> ⅈ </mi>  </mrow>  <mn> 5 </mn>  </mfrac>  </msup>  <mo> ⩵ </mo>  <msubsup>  <mrow>  <mo> ( </mo>  <mrow>  <mi> z </mi>  <mo> ; </mo>  <mrow>  <msup>  <mi> z </mi>  <mn> 4 </mn>  </msup>  <mo> + </mo>  <msup>  <mi> z </mi>  <mn> 3 </mn>  </msup>  <mo> + </mo>  <msup>  <mi> z </mi>  <mn> 2 </mn>  </msup>  <mo> + </mo>  <mi> z </mi>  <mo> + </mo>  <mn> 1 </mn>  </mrow>  </mrow>  <mo> ) </mo>  </mrow>  <mn> 4 </mn>  <mrow>  <mo> - </mo>  <mn> 1 </mn>  </mrow>  </msubsup>  </mrow>  <annotation-xml encoding='MathML-Content'>  <apply>  <eq />  <apply>  <power />  <exponentiale />  <apply>  <times />  <cn type='integer'> 2 </cn>  <pi />  <imaginaryi />  <apply>  <power />  <cn type='integer'> 5 </cn>  <cn type='integer'> -1 </cn>  </apply>  </apply>  </apply>  <apply>  <power />  <apply>  <ci> Subscript </ci>  <apply>  <ci> CompoundExpression </ci>  <ci> z </ci>  <apply>  <plus />  <apply>  <power />  <ci> z </ci>  <cn type='integer'> 4 </cn>  </apply>  <apply>  <power />  <ci> z </ci>  <cn type='integer'> 3 </cn>  </apply>  <apply>  <power />  <ci> z </ci>  <cn type='integer'> 2 </cn>  </apply>  <ci> z </ci>  <cn type='integer'> 1 </cn>  </apply>  </apply>  <cn type='integer'> 4 </cn>  </apply>  <cn type='integer'> -1 </cn>  </apply>  </apply>  </annotation-xml>  </semantics>  </math> 
   
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  | Cell[BoxData[RowBox[List[RowBox[List["HoldPattern", "[", SuperscriptBox["\[ExponentialE]", FractionBox[RowBox[List["2", " ", "\[Pi]", " ", "\[ImaginaryI]"]], "5"]], "]"]], "\[RuleDelayed]", RowBox[List["Root", "[", RowBox[List[RowBox[List[RowBox[List["1", "+", "#1", "+", SuperscriptBox["#1", "2"], "+", SuperscriptBox["#1", "3"], "+", SuperscriptBox["#1", "4"]]], "&"]], ",", "4"]], "]"]]]]]]  |  
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   Date Added to functions.wolfram.com (modification date)
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