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   http://functions.wolfram.com/01.11.03.0066.01
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    Sec[(6 Pi)/7] == -(12 2^(2/3) (7 - 21 I Sqrt[3])^(1/3))/
  (14 - 14 I Sqrt[3] + 2 I Sqrt[3] (7/2 - (21 I Sqrt[3])/2)^(2/3) + 
   2 2^(2/3) (7 - 21 I Sqrt[3])^(1/3) + 2^(1/3) (7 - 21 I Sqrt[3])^(2/3)) 
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   Cell[BoxData[RowBox[List[RowBox[List["Sec", "[", FractionBox[RowBox[List["6", " ", "\[Pi]"]], "7"], "]"]], "\[Equal]", RowBox[List[RowBox[List["-", RowBox[List["(", RowBox[List["12", " ", SuperscriptBox["2", RowBox[List["2", "/", "3"]]], " ", SuperscriptBox[RowBox[List["(", RowBox[List["7", "-", RowBox[List["21", " ", "\[ImaginaryI]", " ", SqrtBox["3"]]]]], ")"]], RowBox[List["1", "/", "3"]]]]], ")"]]]], "/", RowBox[List["(", RowBox[List["14", "-", RowBox[List["14", " ", "\[ImaginaryI]", " ", SqrtBox["3"]]], "+", RowBox[List["2", " ", "\[ImaginaryI]", " ", SqrtBox["3"], " ", SuperscriptBox[RowBox[List["(", RowBox[List[FractionBox["7", "2"], "-", FractionBox[RowBox[List["21", " ", "\[ImaginaryI]", " ", SqrtBox["3"]]], "2"]]], ")"]], RowBox[List["2", "/", "3"]]]]], "+", RowBox[List["2", " ", SuperscriptBox["2", RowBox[List["2", "/", "3"]]], " ", SuperscriptBox[RowBox[List["(", RowBox[List["7", "-", RowBox[List["21", " ", "\[ImaginaryI]", " ", SqrtBox["3"]]]]], ")"]], RowBox[List["1", "/", "3"]]]]], "+", RowBox[List[SuperscriptBox["2", RowBox[List["1", "/", "3"]]], " ", SuperscriptBox[RowBox[List["(", RowBox[List["7", "-", RowBox[List["21", " ", "\[ImaginaryI]", " ", SqrtBox["3"]]]]], ")"]], RowBox[List["2", "/", "3"]]]]]]], ")"]]]]]]]] 
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  | Cell[BoxData[RowBox[List[RowBox[List["HoldPattern", "[", RowBox[List["Sec", "[", FractionBox[RowBox[List["6", " ", "\[Pi]"]], "7"], "]"]], "]"]], "\[RuleDelayed]", RowBox[List["-", FractionBox[RowBox[List["12", " ", SuperscriptBox["2", RowBox[List["2", "/", "3"]]], " ", SuperscriptBox[RowBox[List["(", RowBox[List["7", "-", RowBox[List["21", " ", "\[ImaginaryI]", " ", SqrtBox["3"]]]]], ")"]], RowBox[List["1", "/", "3"]]]]], RowBox[List["14", "-", RowBox[List["14", " ", "\[ImaginaryI]", " ", SqrtBox["3"]]], "+", RowBox[List["2", " ", "\[ImaginaryI]", " ", SqrtBox["3"], " ", SuperscriptBox[RowBox[List["(", RowBox[List[FractionBox["7", "2"], "-", FractionBox[RowBox[List["21", " ", "\[ImaginaryI]", " ", SqrtBox["3"]]], "2"]]], ")"]], RowBox[List["2", "/", "3"]]]]], "+", RowBox[List["2", " ", SuperscriptBox["2", RowBox[List["2", "/", "3"]]], " ", SuperscriptBox[RowBox[List["(", RowBox[List["7", "-", RowBox[List["21", " ", "\[ImaginaryI]", " ", SqrtBox["3"]]]]], ")"]], RowBox[List["1", "/", "3"]]]]], "+", RowBox[List[SuperscriptBox["2", RowBox[List["1", "/", "3"]]], " ", SuperscriptBox[RowBox[List["(", RowBox[List["7", "-", RowBox[List["21", " ", "\[ImaginaryI]", " ", SqrtBox["3"]]]]], ")"]], RowBox[List["2", "/", "3"]]]]]]]]]]]]]]  |  
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   Date Added to functions.wolfram.com (modification date)
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