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   http://functions.wolfram.com/01.10.16.0042.01
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    Csc[a]^2 - Sec[b]^2 == Cos[a - b] Cos[a + b] Csc[a]^2 Sec[b]^2 
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   Cell[BoxData[RowBox[List[RowBox[List[SuperscriptBox[RowBox[List["Csc", "[", "a", "]"]], "2"], "-", SuperscriptBox[RowBox[List["Sec", "[", "b", "]"]], "2"]]], "\[Equal]", RowBox[List[RowBox[List["Cos", "[", RowBox[List["a", "-", "b"]], "]"]], " ", RowBox[List["Cos", "[", RowBox[List["a", "+", "b"]], "]"]], " ", SuperscriptBox[RowBox[List["Csc", "[", "a", "]"]], "2"], " ", SuperscriptBox[RowBox[List["Sec", "[", "b", "]"]], "2"]]]]]]] 
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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>  <mn> 2 </mn>  </msup>  <mo> ( </mo>  <mi> a </mi>  <mo> ) </mo>  </mrow>  <mo> - </mo>  <mrow>  <msup>  <mi> sec </mi>  <mn> 2 </mn>  </msup>  <mo> ( </mo>  <mi> b </mi>  <mo> ) </mo>  </mrow>  </mrow>  <mo> ⩵ </mo>  <mrow>  <mrow>  <mi> cos </mi>  <mo> ⁡ </mo>  <mo> ( </mo>  <mrow>  <mi> a </mi>  <mo> - </mo>  <mi> b </mi>  </mrow>  <mo> ) </mo>  </mrow>  <mo> ⁢ </mo>  <mrow>  <mi> cos </mi>  <mo> ⁡ </mo>  <mo> ( </mo>  <mrow>  <mi> a </mi>  <mo> + </mo>  <mi> b </mi>  </mrow>  <mo> ) </mo>  </mrow>  <mo> ⁢ </mo>  <mrow>  <msup>  <mi> csc </mi>  <mn> 2 </mn>  </msup>  <mo> ( </mo>  <mi> a </mi>  <mo> ) </mo>  </mrow>  <mo> ⁢ </mo>  <mrow>  <msup>  <mi> sec </mi>  <mn> 2 </mn>  </msup>  <mo> ( </mo>  <mi> b </mi>  <mo> ) </mo>  </mrow>  </mrow>  </mrow>  <annotation-xml encoding='MathML-Content'>  <apply>  <eq />  <apply>  <plus />  <apply>  <power />  <apply>  <csc />  <ci> a </ci>  </apply>  <cn type='integer'> 2 </cn>  </apply>  <apply>  <times />  <cn type='integer'> -1 </cn>  <apply>  <power />  <apply>  <sec />  <ci> b </ci>  </apply>  <cn type='integer'> 2 </cn>  </apply>  </apply>  </apply>  <apply>  <times />  <apply>  <cos />  <apply>  <plus />  <ci> a </ci>  <apply>  <times />  <cn type='integer'> -1 </cn>  <ci> b </ci>  </apply>  </apply>  </apply>  <apply>  <cos />  <apply>  <plus />  <ci> a </ci>  <ci> b </ci>  </apply>  </apply>  <apply>  <power />  <apply>  <csc />  <ci> a </ci>  </apply>  <cn type='integer'> 2 </cn>  </apply>  <apply>  <power />  <apply>  <sec />  <ci> b </ci>  </apply>  <cn type='integer'> 2 </cn>  </apply>  </apply>  </apply>  </annotation-xml>  </semantics>  </math> 
   
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  | Cell[BoxData[RowBox[List[RowBox[List["HoldPattern", "[", RowBox[List[SuperscriptBox[RowBox[List["Csc", "[", "a_", "]"]], "2"], "-", SuperscriptBox[RowBox[List["Sec", "[", "b_", "]"]], "2"]]], "]"]], "\[RuleDelayed]", RowBox[List[RowBox[List["Cos", "[", RowBox[List["a", "-", "b"]], "]"]], " ", RowBox[List["Cos", "[", RowBox[List["a", "+", "b"]], "]"]], " ", SuperscriptBox[RowBox[List["Csc", "[", "a", "]"]], "2"], " ", SuperscriptBox[RowBox[List["Sec", "[", "b", "]"]], "2"]]]]]]]  |  
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   Date Added to functions.wolfram.com (modification date)
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