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 Tan

 http://functions.wolfram.com/01.08.16.0053.01

 Input Form

 Tan[a]^2 - Tan[b]^2 == Sec[a]^2 Sec[b]^2 Sin[a - b] Sin[a + b]

 Standard Form

 Cell[BoxData[RowBox[List[RowBox[List[SuperscriptBox[RowBox[List["Tan", "[", "a", "]"]], "2"], "-", SuperscriptBox[RowBox[List["Tan", "[", "b", "]"]], "2"]]], "\[Equal]", RowBox[List[SuperscriptBox[RowBox[List["Sec", "[", "a", "]"]], "2"], " ", SuperscriptBox[RowBox[List["Sec", "[", "b", "]"]], "2"], " ", RowBox[List["Sin", "[", RowBox[List["a", "-", "b"]], "]"]], " ", RowBox[List["Sin", "[", RowBox[List["a", "+", "b"]], "]"]]]]]]]]

 MathML Form

 tan 2 ( a ) - tan 2 ( b ) sec 2 ( a ) sec 2 ( b ) sin ( a - b ) sin ( a + b ) a 2 -1 b 2 a 2 b 2 a -1 b a b [/itex]

 Rule Form

 Cell[BoxData[RowBox[List[RowBox[List["HoldPattern", "[", RowBox[List[SuperscriptBox[RowBox[List["Tan", "[", "a_", "]"]], "2"], "-", SuperscriptBox[RowBox[List["Tan", "[", "b_", "]"]], "2"]]], "]"]], "\[RuleDelayed]", RowBox[List[SuperscriptBox[RowBox[List["Sec", "[", "a", "]"]], "2"], " ", SuperscriptBox[RowBox[List["Sec", "[", "b", "]"]], "2"], " ", 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