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   http://functions.wolfram.com/01.10.03.0007.01
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    Csc[Pi/9] == (4 2^(1/3))/((-1 - I Sqrt[3])^(1/3) (-I + Sqrt[3]) + 
   (-1 + I Sqrt[3])^(1/3) (I + Sqrt[3])) 
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   Cell[BoxData[RowBox[List[RowBox[List["Csc", "[", FractionBox["\[Pi]", "9"], "]"]], "\[Equal]", FractionBox[RowBox[List["4", " ", SuperscriptBox["2", RowBox[List["1", "/", "3"]]]]], RowBox[List[RowBox[List[SuperscriptBox[RowBox[List["(", RowBox[List[RowBox[List["-", "1"]], "-", RowBox[List["\[ImaginaryI]", " ", SqrtBox["3"]]]]], ")"]], RowBox[List["1", "/", "3"]]], " ", RowBox[List["(", RowBox[List[RowBox[List["-", "\[ImaginaryI]"]], "+", SqrtBox["3"]]], ")"]]]], "+", RowBox[List[SuperscriptBox[RowBox[List["(", RowBox[List[RowBox[List["-", "1"]], "+", RowBox[List["\[ImaginaryI]", " ", SqrtBox["3"]]]]], ")"]], RowBox[List["1", "/", "3"]]], " ", RowBox[List["(", RowBox[List["\[ImaginaryI]", "+", SqrtBox["3"]]], ")"]]]]]]]]]]] 
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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> csc </mi>  <mo> ⁡ </mo>  <mo> ( </mo>  <mfrac>  <mi> π </mi>  <mn> 9 </mn>  </mfrac>  <mo> ) </mo>  </mrow>  <mo> ⩵ </mo>  <mfrac>  <mrow>  <mn> 4 </mn>  <mo> ⁢ </mo>  <mroot>  <mn> 2 </mn>  <mn> 3 </mn>  </mroot>  </mrow>  <mrow>  <mrow>  <mrow>  <mo> ( </mo>  <mrow>  <mi> ⅈ </mi>  <mo> + </mo>  <msqrt>  <mn> 3 </mn>  </msqrt>  </mrow>  <mo> ) </mo>  </mrow>  <mo> ⁢ </mo>  <mroot>  <mrow>  <mrow>  <mo> - </mo>  <mn> 1 </mn>  </mrow>  <mo> + </mo>  <mrow>  <mi> ⅈ </mi>  <mo> ⁢ </mo>  <msqrt>  <mn> 3 </mn>  </msqrt>  </mrow>  </mrow>  <mn> 3 </mn>  </mroot>  </mrow>  <mo> + </mo>  <mrow>  <mrow>  <mo> ( </mo>  <mrow>  <mrow>  <mo> - </mo>  <mi> ⅈ </mi>  </mrow>  <mo> + </mo>  <msqrt>  <mn> 3 </mn>  </msqrt>  </mrow>  <mo> ) </mo>  </mrow>  <mo> ⁢ </mo>  <mroot>  <mrow>  <mrow>  <mo> - </mo>  <mn> 1 </mn>  </mrow>  <mo> - </mo>  <mrow>  <mi> ⅈ </mi>  <mo> ⁢ </mo>  <msqrt>  <mn> 3 </mn>  </msqrt>  </mrow>  </mrow>  <mn> 3 </mn>  </mroot>  </mrow>  </mrow>  </mfrac>  </mrow>  <annotation-xml encoding='MathML-Content'>  <apply>  <eq />  <apply>  <csc />  <apply>  <times />  <pi />  <apply>  <power />  <cn type='integer'> 9 </cn>  <cn type='integer'> -1 </cn>  </apply>  </apply>  </apply>  <apply>  <times />  <cn type='integer'> 4 </cn>  <apply>  <power />  <cn type='integer'> 2 </cn>  <cn type='rational'> 1 <sep /> 3 </cn>  </apply>  <apply>  <power />  <apply>  <plus />  <apply>  <times />  <apply>  <plus />  <imaginaryi />  <apply>  <power />  <cn type='integer'> 3 </cn>  <cn type='rational'> 1 <sep /> 2 </cn>  </apply>  </apply>  <apply>  <power />  <apply>  <plus />  <cn type='integer'> -1 </cn>  <apply>  <times />  <imaginaryi />  <apply>  <power />  <cn type='integer'> 3 </cn>  <cn type='rational'> 1 <sep /> 2 </cn>  </apply>  </apply>  </apply>  <cn type='rational'> 1 <sep /> 3 </cn>  </apply>  </apply>  <apply>  <times />  <apply>  <plus />  <apply>  <times />  <cn type='integer'> -1 </cn>  <imaginaryi />  </apply>  <apply>  <power />  <cn type='integer'> 3 </cn>  <cn type='rational'> 1 <sep /> 2 </cn>  </apply>  </apply>  <apply>  <power />  <apply>  <plus />  <cn type='integer'> -1 </cn>  <apply>  <times />  <cn type='integer'> -1 </cn>  <apply>  <times />  <imaginaryi />  <apply>  <power />  <cn type='integer'> 3 </cn>  <cn type='rational'> 1 <sep /> 2 </cn>  </apply>  </apply>  </apply>  </apply>  <cn type='rational'> 1 <sep /> 3 </cn>  </apply>  </apply>  </apply>  <cn type='integer'> -1 </cn>  </apply>  </apply>  </apply>  </annotation-xml>  </semantics>  </math> 
   
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  | Cell[BoxData[RowBox[List[RowBox[List["HoldPattern", "[", RowBox[List["Csc", "[", FractionBox["\[Pi]", "9"], "]"]], "]"]], "\[RuleDelayed]", FractionBox[RowBox[List["4", " ", SuperscriptBox["2", RowBox[List["1", "/", "3"]]]]], RowBox[List[RowBox[List[SuperscriptBox[RowBox[List["(", RowBox[List[RowBox[List["-", "1"]], "-", RowBox[List["\[ImaginaryI]", " ", SqrtBox["3"]]]]], ")"]], RowBox[List["1", "/", "3"]]], " ", RowBox[List["(", RowBox[List[RowBox[List["-", "\[ImaginaryI]"]], "+", SqrtBox["3"]]], ")"]]]], "+", RowBox[List[SuperscriptBox[RowBox[List["(", RowBox[List[RowBox[List["-", "1"]], "+", RowBox[List["\[ImaginaryI]", " ", SqrtBox["3"]]]]], ")"]], RowBox[List["1", "/", "3"]]], " ", RowBox[List["(", RowBox[List["\[ImaginaryI]", "+", SqrtBox["3"]]], ")"]]]]]]]]]]]  |  
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   Date Added to functions.wolfram.com (modification date)
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