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   http://functions.wolfram.com/01.10.27.0072.01
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    ArcCsc[Csc[z]] == -Pi - z /; -((3 Pi)/2) < Re[z] < -(Pi/2) || 
  (Re[z] == -((3 Pi)/2) && Im[z] >= 0) || (Re[z] == -(Pi/2) && Im[z] <= 0) 
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   Cell[BoxData[RowBox[List[RowBox[List[RowBox[List["ArcCsc", "[", RowBox[List["Csc", "[", "z", "]"]], "]"]], "\[Equal]", RowBox[List[RowBox[List["-", "\[Pi]"]], "-", "z"]]]], "/;", RowBox[List[RowBox[List[RowBox[List["-", FractionBox[RowBox[List["3", "\[Pi]"]], "2"]]], "<", RowBox[List["Re", "[", "z", "]"]], "<", RowBox[List["-", FractionBox["\[Pi]", "2"]]]]], "\[Or]", RowBox[List["(", RowBox[List[RowBox[List[RowBox[List["Re", "[", "z", "]"]], "\[Equal]", RowBox[List["-", FractionBox[RowBox[List["3", "\[Pi]"]], "2"]]]]], "\[And]", RowBox[List[RowBox[List["Im", "[", "z", "]"]], "\[GreaterEqual]", "0"]]]], ")"]], "\[Or]", RowBox[List["(", RowBox[List[RowBox[List[RowBox[List["Re", "[", "z", "]"]], "\[Equal]", RowBox[List["-", FractionBox["\[Pi]", "2"]]]]], "\[And]", RowBox[List[RowBox[List["Im", "[", "z", "]"]], "\[LessEqual]", "0"]]]], ")"]]]]]]]] 
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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>  <mrow>  <msup>  <mi> csc </mi>  <mrow>  <mo> - </mo>  <mn> 1 </mn>  </mrow>  </msup>  <mo> ( </mo>  <mrow>  <mi> csc </mi>  <mo> ⁡ </mo>  <mo> ( </mo>  <mi> z </mi>  <mo> ) </mo>  </mrow>  <mo> ) </mo>  </mrow>  <mo> ⩵ </mo>  <mrow>  <mrow>  <mo> - </mo>  <mi> z </mi>  </mrow>  <mo> - </mo>  <mi> π </mi>  </mrow>  </mrow>  <mo> /; </mo>  <mrow>  <mrow>  <mrow>  <mo> - </mo>  <mfrac>  <mrow>  <mn> 3 </mn>  <mo> ⁢ </mo>  <mi> π </mi>  </mrow>  <mn> 2 </mn>  </mfrac>  </mrow>  <mo> < </mo>  <mrow>  <mi> Re </mi>  <mo> ⁡ </mo>  <mo> ( </mo>  <mi> z </mi>  <mo> ) </mo>  </mrow>  <mo> < </mo>  <mrow>  <mo> - </mo>  <mfrac>  <mi> π </mi>  <mn> 2 </mn>  </mfrac>  </mrow>  </mrow>  <mo> ∨ </mo>  <mrow>  <mrow>  <mrow>  <mi> Re </mi>  <mo> ⁡ </mo>  <mo> ( </mo>  <mi> z </mi>  <mo> ) </mo>  </mrow>  <mo> ⩵ </mo>  <mrow>  <mo> - </mo>  <mfrac>  <mrow>  <mn> 3 </mn>  <mo> ⁢ </mo>  <mi> π </mi>  </mrow>  <mn> 2 </mn>  </mfrac>  </mrow>  </mrow>  <mo> ∧ </mo>  <mrow>  <mrow>  <mi> Im </mi>  <mo> ⁡ </mo>  <mo> ( </mo>  <mi> z </mi>  <mo> ) </mo>  </mrow>  <mo> ≥ </mo>  <mn> 0 </mn>  </mrow>  </mrow>  <mo> ∨ </mo>  <mrow>  <mrow>  <mrow>  <mi> Re </mi>  <mo> ⁡ </mo>  <mo> ( </mo>  <mi> z </mi>  <mo> ) </mo>  </mrow>  <mo> ⩵ </mo>  <mrow>  <mo> - </mo>  <mfrac>  <mi> π </mi>  <mn> 2 </mn>  </mfrac>  </mrow>  </mrow>  <mo> ∧ </mo>  <mrow>  <mrow>  <mi> Im </mi>  <mo> ⁡ </mo>  <mo> ( </mo>  <mi> z </mi>  <mo> ) </mo>  </mrow>  <mo> ≤ </mo>  <mn> 0 </mn>  </mrow>  </mrow>  </mrow>  </mrow>  <annotation-xml encoding='MathML-Content'>  <apply>  <ci> Condition </ci>  <apply>  <eq />  <apply>  <arccsc />  <apply>  <csc />  <ci> z </ci>  </apply>  </apply>  <apply>  <plus />  <apply>  <times />  <cn type='integer'> -1 </cn>  <ci> z </ci>  </apply>  <apply>  <times />  <cn type='integer'> -1 </cn>  <pi />  </apply>  </apply>  </apply>  <apply>  <or />  <apply>  <lt />  <apply>  <times />  <cn type='integer'> -1 </cn>  <apply>  <times />  <cn type='integer'> 3 </cn>  <pi />  <apply>  <power />  <cn type='integer'> 2 </cn>  <cn type='integer'> -1 </cn>  </apply>  </apply>  </apply>  <apply>  <real />  <ci> z </ci>  </apply>  <apply>  <times />  <cn type='integer'> -1 </cn>  <apply>  <times />  <pi />  <apply>  <power />  <cn type='integer'> 2 </cn>  <cn type='integer'> -1 </cn>  </apply>  </apply>  </apply>  </apply>  <apply>  <and />  <apply>  <eq />  <apply>  <real />  <ci> z </ci>  </apply>  <apply>  <times />  <cn type='integer'> -1 </cn>  <apply>  <times />  <cn type='integer'> 3 </cn>  <pi />  <apply>  <power />  <cn type='integer'> 2 </cn>  <cn type='integer'> -1 </cn>  </apply>  </apply>  </apply>  </apply>  <apply>  <geq />  <apply>  <imaginary />  <ci> z </ci>  </apply>  <cn type='integer'> 0 </cn>  </apply>  </apply>  <apply>  <and />  <apply>  <eq />  <apply>  <real />  <ci> z </ci>  </apply>  <apply>  <times />  <cn type='integer'> -1 </cn>  <apply>  <times />  <pi />  <apply>  <power />  <cn type='integer'> 2 </cn>  <cn type='integer'> -1 </cn>  </apply>  </apply>  </apply>  </apply>  <apply>  <leq />  <apply>  <imaginary />  <ci> z </ci>  </apply>  <cn type='integer'> 0 </cn>  </apply>  </apply>  </apply>  </apply>  </annotation-xml>  </semantics>  </math> 
   
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  | Cell[BoxData[RowBox[List[RowBox[List["HoldPattern", "[", RowBox[List["ArcCsc", "[", RowBox[List["Csc", "[", "z_", "]"]], "]"]], "]"]], "\[RuleDelayed]", RowBox[List[RowBox[List[RowBox[List["-", "\[Pi]"]], "-", "z"]], "/;", RowBox[List[RowBox[List[RowBox[List[RowBox[List["-", FractionBox["1", "2"]]], " ", RowBox[List["(", RowBox[List["3", " ", "\[Pi]"]], ")"]]]], "<", RowBox[List["Re", "[", "z", "]"]], "<", RowBox[List["-", FractionBox["\[Pi]", "2"]]]]], "||", RowBox[List["(", RowBox[List[RowBox[List[RowBox[List["Re", "[", "z", "]"]], "\[Equal]", RowBox[List[RowBox[List["-", FractionBox["1", "2"]]], " ", RowBox[List["(", RowBox[List["3", " ", "\[Pi]"]], ")"]]]]]], "&&", RowBox[List[RowBox[List["Im", "[", "z", "]"]], "\[GreaterEqual]", "0"]]]], ")"]], "||", RowBox[List["(", RowBox[List[RowBox[List[RowBox[List["Re", "[", "z", "]"]], "\[Equal]", RowBox[List["-", FractionBox["\[Pi]", "2"]]]]], "&&", RowBox[List[RowBox[List["Im", "[", "z", "]"]], "\[LessEqual]", "0"]]]], ")"]]]]]]]]]]  |  
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   Date Added to functions.wolfram.com (modification date)
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