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 Csc

 http://functions.wolfram.com/01.10.16.0039.01

 Input Form

 Csc[a] - Csc[b] == -2 Sin[(a - b)/2] Cos[(a + b)/2] Csc[a] Csc[b]

 Standard Form

 Cell[BoxData[RowBox[List[RowBox[List[RowBox[List["Csc", "[", "a", "]"]], "-", RowBox[List["Csc", "[", "b", "]"]]]], "\[Equal]", RowBox[List[RowBox[List["-", "2"]], " ", RowBox[List["Sin", "[", FractionBox[RowBox[List["a", "-", "b"]], "2"], "]"]], " ", RowBox[List["Cos", "[", FractionBox[RowBox[List["a", "+", "b"]], "2"], "]"]], " ", RowBox[List["Csc", "[", "a", "]"]], " ", RowBox[List["Csc", "[", "b", "]"]]]]]]]]

 MathML Form

 csc ( a ) - csc ( b ) - 2 sin ( a - b 2 ) cos ( a + b 2 ) csc ( a ) csc ( b ) a -1 b -2 a -1 b 2 -1 a b 2 -1 a b [/itex]

 Rule Form

 Cell[BoxData[RowBox[List[RowBox[List["HoldPattern", "[", RowBox[List[RowBox[List["Csc", "[", "a_", "]"]], "-", RowBox[List["Csc", "[", "b_", "]"]]]], "]"]], "\[RuleDelayed]", RowBox[List[RowBox[List["-", "2"]], " ", RowBox[List["Sin", "[", FractionBox[RowBox[List["a", "-", "b"]], "2"], "]"]], " ", RowBox[List["Cos", "[", FractionBox[RowBox[List["a", "+", "b"]], "2"], "]"]], " ", RowBox[List["Csc", "[", "a", "]"]], " ", RowBox[List["Csc", "[", "b", "]"]]]]]]]]

 Date Added to functions.wolfram.com (modification date)

 2001-10-29