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 Tan

 http://functions.wolfram.com/01.08.16.0046.01

 Input Form

 Tan[a] Cot[b] == (Sin[a + b] + Sin[a - b])/(Sin[a + b] - Sin[a - b])

 Standard Form

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

 MathML Form

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

 Rule Form

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

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

 2001-10-29