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   http://functions.wolfram.com/01.10.27.0024.01
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    Csc[z] == Sqrt[1 + Cot[z]^2] (-1)^Floor[Re[z]/Pi] 
  (1 - ((-1)^(Floor[Re[z]/Pi] + Floor[-(Re[z]/Pi)]) + 1) UnitStep[Im[z]]) 
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   Cell[BoxData[RowBox[List[RowBox[List["Csc", "[", "z", "]"]], "\[Equal]", RowBox[List[SqrtBox[RowBox[List["1", "+", SuperscriptBox[RowBox[List["Cot", "[", "z", "]"]], "2"]]]], SuperscriptBox[RowBox[List["(", RowBox[List["-", "1"]], ")"]], RowBox[List["Floor", "[", FractionBox[RowBox[List["Re", "[", "z", "]"]], "\[Pi]"], "]"]]], " ", RowBox[List["(", RowBox[List["1", "-", RowBox[List[RowBox[List["(", RowBox[List[SuperscriptBox[RowBox[List["(", RowBox[List["-", "1"]], ")"]], RowBox[List[RowBox[List["Floor", "[", FractionBox[RowBox[List["Re", "[", "z", "]"]], "\[Pi]"], "]"]], "+", RowBox[List["Floor", "[", RowBox[List["-", FractionBox[RowBox[List["Re", "[", "z", "]"]], "\[Pi]"]]], "]"]]]]], "+", "1"]], ")"]], " ", RowBox[List["UnitStep", "[", RowBox[List["Im", "[", "z", "]"]], "]"]]]]]], ")"]]]]]]]] 
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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>  <mi> z </mi>  <mo> ) </mo>  </mrow>  <mo> ⩵ </mo>  <mrow>  <msqrt>  <mrow>  <mrow>  <msup>  <mi> cot </mi>  <mn> 2 </mn>  </msup>  <mo> ( </mo>  <mi> z </mi>  <mo> ) </mo>  </mrow>  <mo> + </mo>  <mn> 1 </mn>  </mrow>  </msqrt>  <mo> ⁢ </mo>  <msup>  <mrow>  <mo> ( </mo>  <mrow>  <mo> - </mo>  <mn> 1 </mn>  </mrow>  <mo> ) </mo>  </mrow>  <mrow>  <mo> ⌊ </mo>  <mfrac>  <mrow>  <mi> Re </mi>  <mo> ⁡ </mo>  <mo> ( </mo>  <mi> z </mi>  <mo> ) </mo>  </mrow>  <mi> π </mi>  </mfrac>  <mo> ⌋ </mo>  </mrow>  </msup>  <mo> ⁢ </mo>  <mrow>  <mo> ( </mo>  <mrow>  <mn> 1 </mn>  <mo> - </mo>  <mrow>  <mrow>  <mo> ( </mo>  <mrow>  <msup>  <mrow>  <mo> ( </mo>  <mrow>  <mo> - </mo>  <mn> 1 </mn>  </mrow>  <mo> ) </mo>  </mrow>  <mrow>  <mrow>  <mo> ⌊ </mo>  <mfrac>  <mrow>  <mi> Re </mi>  <mo> ⁡ </mo>  <mo> ( </mo>  <mi> z </mi>  <mo> ) </mo>  </mrow>  <mi> π </mi>  </mfrac>  <mo> ⌋ </mo>  </mrow>  <mo> + </mo>  <mrow>  <mo> ⌊ </mo>  <mrow>  <mo> - </mo>  <mfrac>  <mrow>  <mi> Re </mi>  <mo> ⁡ </mo>  <mo> ( </mo>  <mi> z </mi>  <mo> ) </mo>  </mrow>  <mi> π </mi>  </mfrac>  </mrow>  <mo> ⌋ </mo>  </mrow>  </mrow>  </msup>  <mo> + </mo>  <mn> 1 </mn>  </mrow>  <mo> ) </mo>  </mrow>  <mo> ⁢ </mo>  <mrow>  <mi> θ </mi>  <mo> ⁡ </mo>  <mo> ( </mo>  <mrow>  <mi> Im </mi>  <mo> ⁡ </mo>  <mo> ( </mo>  <mi> z </mi>  <mo> ) </mo>  </mrow>  <mo> ) </mo>  </mrow>  </mrow>  </mrow>  <mo> ) </mo>  </mrow>  </mrow>  </mrow>  <annotation-xml encoding='MathML-Content'>  <apply>  <eq />  <apply>  <csc />  <ci> z </ci>  </apply>  <apply>  <times />  <apply>  <power />  <apply>  <plus />  <apply>  <power />  <apply>  <cot />  <ci> z </ci>  </apply>  <cn type='integer'> 2 </cn>  </apply>  <cn type='integer'> 1 </cn>  </apply>  <cn type='rational'> 1 <sep /> 2 </cn>  </apply>  <apply>  <power />  <cn type='integer'> -1 </cn>  <apply>  <floor />  <apply>  <times />  <apply>  <real />  <ci> z </ci>  </apply>  <apply>  <power />  <pi />  <cn type='integer'> -1 </cn>  </apply>  </apply>  </apply>  </apply>  <apply>  <plus />  <cn type='integer'> 1 </cn>  <apply>  <times />  <cn type='integer'> -1 </cn>  <apply>  <times />  <apply>  <plus />  <apply>  <power />  <cn type='integer'> -1 </cn>  <apply>  <plus />  <apply>  <floor />  <apply>  <times />  <apply>  <real />  <ci> z </ci>  </apply>  <apply>  <power />  <pi />  <cn type='integer'> -1 </cn>  </apply>  </apply>  </apply>  <apply>  <floor />  <apply>  <times />  <cn type='integer'> -1 </cn>  <apply>  <times />  <apply>  <real />  <ci> z </ci>  </apply>  <apply>  <power />  <pi />  <cn type='integer'> -1 </cn>  </apply>  </apply>  </apply>  </apply>  </apply>  </apply>  <cn type='integer'> 1 </cn>  </apply>  <apply>  <ci> θ </ci>  <apply>  <imaginary />  <ci> z </ci>  </apply>  </apply>  </apply>  </apply>  </apply>  </apply>  </apply>  </annotation-xml>  </semantics>  </math> 
   
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  | Cell[BoxData[RowBox[List[RowBox[List["HoldPattern", "[", RowBox[List["Csc", "[", "z_", "]"]], "]"]], "\[RuleDelayed]", RowBox[List[SqrtBox[RowBox[List["1", "+", SuperscriptBox[RowBox[List["Cot", "[", "z", "]"]], "2"]]]], " ", SuperscriptBox[RowBox[List["(", RowBox[List["-", "1"]], ")"]], RowBox[List["Floor", "[", FractionBox[RowBox[List["Re", "[", "z", "]"]], "\[Pi]"], "]"]]], " ", RowBox[List["(", RowBox[List["1", "-", RowBox[List[RowBox[List["(", RowBox[List[SuperscriptBox[RowBox[List["(", RowBox[List["-", "1"]], ")"]], RowBox[List[RowBox[List["Floor", "[", FractionBox[RowBox[List["Re", "[", "z", "]"]], "\[Pi]"], "]"]], "+", RowBox[List["Floor", "[", RowBox[List["-", FractionBox[RowBox[List["Re", "[", "z", "]"]], "\[Pi]"]]], "]"]]]]], "+", "1"]], ")"]], " ", RowBox[List["UnitStep", "[", RowBox[List["Im", "[", "z", "]"]], "]"]]]]]], ")"]]]]]]]]  |  
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   Date Added to functions.wolfram.com (modification date)
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