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 Sin

 http://functions.wolfram.com/01.06.16.0121.01

 Input Form

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

 Standard Form

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

 MathML Form

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

 Rule Form

 Cell[BoxData[RowBox[List[RowBox[List["HoldPattern", "[", RowBox[List[RowBox[List["Sin", "[", "a_", "]"]], "+", RowBox[List["\[ImaginaryI]", " ", RowBox[List["Sinh", "[", "b_", "]"]]]]]], "]"]], "\[RuleDelayed]", RowBox[List["2", " ", RowBox[List["Cos", "[", RowBox[List[FractionBox["1", "2"], " ", RowBox[List["(", RowBox[List["a", "-", RowBox[List["\[ImaginaryI]", " ", "b"]]]], ")"]]]], "]"]], " ", RowBox[List["Sin", "[", RowBox[List[FractionBox["1", "2"], " ", RowBox[List["(", RowBox[List["a", "+", RowBox[List["\[ImaginaryI]", " ", "b"]]]], ")"]]]], "]"]]]]]]]]

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

 2003-08-21