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 | | http://functions.wolfram.com/01.10.16.0050.01 | 
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 | | Csc[a] - Sec[b] == 2 Cos[(a + b)/2 + Pi/4] Cos[(a - b)/2 + Pi/4] Csc[a] Sec[b] | 
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 | | Cell[BoxData[RowBox[List[RowBox[List[RowBox[List["Csc", "[", "a", "]"]], "-", RowBox[List["Sec", "[", "b", "]"]]]], "\[Equal]", RowBox[List["2", RowBox[List["Cos", "[", RowBox[List[FractionBox[RowBox[List["a", "+", "b"]], "2"], "+", FractionBox["\[Pi]", "4"]]], "]"]], RowBox[List["Cos", "[", RowBox[List[FractionBox[RowBox[List["a", "-", "b"]], "2"], "+", FractionBox["\[Pi]", "4"]]], "]"]], RowBox[List["Csc", "[", "a", "]"]], " ", RowBox[List["Sec", "[", "b", "]"]]]]]]]] | 
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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>  <mi> csc </mi>  <mo> ⁡ </mo>  <mo> ( </mo>  <mi> a </mi>  <mo> ) </mo>  </mrow>  <mo> - </mo>  <mrow>  <mi> sec </mi>  <mo> ⁡ </mo>  <mo> ( </mo>  <mi> b </mi>  <mo> ) </mo>  </mrow>  </mrow>  <mo> ⩵ </mo>  <mrow>  <mn> 2 </mn>  <mo> ⁢ </mo>  <mrow>  <mi> cos </mi>  <mo> ⁡ </mo>  <mo> ( </mo>  <mrow>  <mfrac>  <mrow>  <mi> a </mi>  <mo> + </mo>  <mi> b </mi>  </mrow>  <mn> 2 </mn>  </mfrac>  <mo> + </mo>  <mfrac>  <mi> π </mi>  <mn> 4 </mn>  </mfrac>  </mrow>  <mo> ) </mo>  </mrow>  <mo> ⁢ </mo>  <mrow>  <mi> cos </mi>  <mo> ⁡ </mo>  <mo> ( </mo>  <mrow>  <mfrac>  <mrow>  <mi> a </mi>  <mo> - </mo>  <mi> b </mi>  </mrow>  <mn> 2 </mn>  </mfrac>  <mo> + </mo>  <mfrac>  <mi> π </mi>  <mn> 4 </mn>  </mfrac>  </mrow>  <mo> ) </mo>  </mrow>  <mo> ⁢ </mo>  <mrow>  <mi> csc </mi>  <mo> ⁡ </mo>  <mo> ( </mo>  <mi> a </mi>  <mo> ) </mo>  </mrow>  <mo> ⁢ </mo>  <mrow>  <mi> sec </mi>  <mo> ⁡ </mo>  <mo> ( </mo>  <mi> b </mi>  <mo> ) </mo>  </mrow>  </mrow>  </mrow>  <annotation-xml encoding='MathML-Content'>  <apply>  <eq />  <apply>  <plus />  <apply>  <csc />  <ci> a </ci>  </apply>  <apply>  <times />  <cn type='integer'> -1 </cn>  <apply>  <sec />  <ci> b </ci>  </apply>  </apply>  </apply>  <apply>  <times />  <cn type='integer'> 2 </cn>  <apply>  <cos />  <apply>  <plus />  <apply>  <times />  <apply>  <plus />  <ci> a </ci>  <ci> b </ci>  </apply>  <apply>  <power />  <cn type='integer'> 2 </cn>  <cn type='integer'> -1 </cn>  </apply>  </apply>  <apply>  <times />  <pi />  <apply>  <power />  <cn type='integer'> 4 </cn>  <cn type='integer'> -1 </cn>  </apply>  </apply>  </apply>  </apply>  <apply>  <cos />  <apply>  <plus />  <apply>  <times />  <apply>  <plus />  <ci> a </ci>  <apply>  <times />  <cn type='integer'> -1 </cn>  <ci> b </ci>  </apply>  </apply>  <apply>  <power />  <cn type='integer'> 2 </cn>  <cn type='integer'> -1 </cn>  </apply>  </apply>  <apply>  <times />  <pi />  <apply>  <power />  <cn type='integer'> 4 </cn>  <cn type='integer'> -1 </cn>  </apply>  </apply>  </apply>  </apply>  <apply>  <csc />  <ci> a </ci>  </apply>  <apply>  <sec />  <ci> b </ci>  </apply>  </apply>  </apply>  </annotation-xml>  </semantics>  </math> 
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 | | Cell[BoxData[RowBox[List[RowBox[List["HoldPattern", "[", RowBox[List[RowBox[List["Csc", "[", "a_", "]"]], "-", RowBox[List["Sec", "[", "b_", "]"]]]], "]"]], "\[RuleDelayed]", RowBox[List["2", " ", RowBox[List["Cos", "[", RowBox[List[FractionBox[RowBox[List["a", "+", "b"]], "2"], "+", FractionBox["\[Pi]", "4"]]], "]"]], " ", RowBox[List["Cos", "[", RowBox[List[FractionBox[RowBox[List["a", "-", "b"]], "2"], "+", FractionBox["\[Pi]", "4"]]], "]"]], " ", RowBox[List["Csc", "[", "a", "]"]], " ", RowBox[List["Sec", "[", "b", "]"]]]]]]]] | 
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 | | Date Added to functions.wolfram.com (modification date) | 
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