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   http://functions.wolfram.com/01.10.03.0075.01
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    Csc[(8 Pi)/9] == (2 (-1)^(7/18))/(1 + (-1)^(7/9)) 
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   Cell[BoxData[RowBox[List[RowBox[List["Csc", "[", FractionBox[RowBox[List["8", " ", "\[Pi]"]], "9"], "]"]], "\[Equal]", FractionBox[RowBox[List["2", " ", SuperscriptBox[RowBox[List["(", RowBox[List["-", "1"]], ")"]], RowBox[List["7", "/", "18"]]]]], RowBox[List["1", "+", SuperscriptBox[RowBox[List["(", RowBox[List["-", "1"]], ")"]], RowBox[List["7", "/", "9"]]]]]]]]]] 
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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>  <mrow>  <mn> 8 </mn>  <mo> ⁢ </mo>  <mi> π </mi>  </mrow>  <mn> 9 </mn>  </mfrac>  <mo> ) </mo>  </mrow>  <mo> ⩵ </mo>  <mfrac>  <mrow>  <mn> 2 </mn>  <mo> ⁢ </mo>  <msup>  <mrow>  <mo> ( </mo>  <mrow>  <mo> - </mo>  <mn> 1 </mn>  </mrow>  <mo> ) </mo>  </mrow>  <mrow>  <mn> 7 </mn>  <mo> / </mo>  <mn> 18 </mn>  </mrow>  </msup>  </mrow>  <mrow>  <mn> 1 </mn>  <mo> + </mo>  <msup>  <mrow>  <mo> ( </mo>  <mrow>  <mo> - </mo>  <mn> 1 </mn>  </mrow>  <mo> ) </mo>  </mrow>  <mrow>  <mn> 7 </mn>  <mo> / </mo>  <mn> 9 </mn>  </mrow>  </msup>  </mrow>  </mfrac>  </mrow>  <annotation-xml encoding='MathML-Content'>  <apply>  <eq />  <apply>  <csc />  <apply>  <times />  <cn type='integer'> 8 </cn>  <pi />  <apply>  <power />  <cn type='integer'> 9 </cn>  <cn type='integer'> -1 </cn>  </apply>  </apply>  </apply>  <apply>  <times />  <cn type='integer'> 2 </cn>  <apply>  <power />  <cn type='integer'> -1 </cn>  <cn type='rational'> 7 <sep /> 18 </cn>  </apply>  <apply>  <power />  <apply>  <plus />  <cn type='integer'> 1 </cn>  <apply>  <power />  <cn type='integer'> -1 </cn>  <cn type='rational'> 7 <sep /> 9 </cn>  </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[RowBox[List["8", " ", "\[Pi]"]], "9"], "]"]], "]"]], "\[RuleDelayed]", FractionBox[RowBox[List["2", " ", SuperscriptBox[RowBox[List["(", RowBox[List["-", "1"]], ")"]], RowBox[List["7", "/", "18"]]]]], RowBox[List["1", "+", SuperscriptBox[RowBox[List["(", RowBox[List["-", "1"]], ")"]], RowBox[List["7", "/", "9"]]]]]]]]]]  |  
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   Date Added to functions.wolfram.com (modification date)
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