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 Cot

 http://functions.wolfram.com/01.09.16.0045.01

 Input Form

 Cot[a] Cot[b] == (Cos[a - b] + Cos[a + b])/(Cos[a - b] - Cos[a + b])

 Standard Form

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

 MathML Form

 cot ( a ) cot ( b ) cos ( a - b ) + cos ( a + b ) cos ( a - b ) - cos ( a + b ) a b a -1 b a b a -1 b -1 a b -1 [/itex]

 Rule Form

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

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

 2001-10-29