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 Cos

 http://functions.wolfram.com/01.07.16.0119.01

 Input Form

 a Cos[z] + b Sin[z] == b Sqrt[1 + a^2/b^2] Sin[z + ArcTan[a/b]]

 Standard Form

 Cell[BoxData[RowBox[List[RowBox[List[RowBox[List["a", " ", RowBox[List["Cos", "[", "z", "]"]]]], "+", RowBox[List["b", " ", RowBox[List["Sin", "[", "z", "]"]]]]]], "\[Equal]", RowBox[List["b", SqrtBox[RowBox[List["1", "+", FractionBox[SuperscriptBox["a", "2"], SuperscriptBox["b", "2"]]]]], RowBox[List["Sin", "[", RowBox[List["z", "+", RowBox[List["ArcTan", "[", RowBox[List["a", "/", "b"]], "]"]]]], "]"]]]]]]]]

 MathML Form

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

 Rule Form

 Cell[BoxData[RowBox[List[RowBox[List["HoldPattern", "[", RowBox[List[RowBox[List["a_", " ", RowBox[List["Cos", "[", "z_", "]"]]]], "+", RowBox[List["b_", " ", RowBox[List["Sin", "[", "z_", "]"]]]]]], "]"]], "\[RuleDelayed]", RowBox[List["b", " ", SqrtBox[RowBox[List["1", "+", FractionBox[SuperscriptBox["a", "2"], SuperscriptBox["b", "2"]]]]], " ", RowBox[List["Sin", "[", RowBox[List["z", "+", RowBox[List["ArcTan", "[", FractionBox["a", "b"], "]"]]]], "]"]]]]]]]]

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

 2003-08-21