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 Cos

 http://functions.wolfram.com/01.07.13.0012.01

 Input Form

 Wronskian[z^s Cos[a z^r], z^s Sin[a z^r], z] == a r z^(-1 + r + 2 s)

 Standard Form

 Cell[BoxData[RowBox[List[RowBox[List["Wronskian", "[", RowBox[List[RowBox[List[SuperscriptBox["z", "s"], RowBox[List["Cos", "[", RowBox[List["a", " ", SuperscriptBox["z", "r"]]], "]"]]]], ",", RowBox[List[SuperscriptBox["z", "s"], RowBox[List["Sin", "[", RowBox[List["a", " ", SuperscriptBox["z", "r"]]], "]"]]]], ",", "z"]], "]"]], "\[Equal]", RowBox[List["a", " ", "r", " ", SuperscriptBox["z", RowBox[List[RowBox[List["-", "1"]], "+", "r", "+", RowBox[List["2", " ", "s"]]]]]]]]]]]

 MathML Form

 W z ( z s cos ( a z r ) , z s sin ( a z r ) ) a r z r + 2 s - 1 Subscript W z z s a z r z s a z r a r z r 2 s -1 [/itex]

 Rule Form

 Cell[BoxData[RowBox[List[RowBox[List["HoldPattern", "[", RowBox[List["Wronskian", "[", RowBox[List[RowBox[List[SuperscriptBox["z_", "s_"], " ", RowBox[List["Cos", "[", RowBox[List["a_", " ", SuperscriptBox["z_", "r_"]]], "]"]]]], ",", RowBox[List[SuperscriptBox["z_", "s_"], " ", RowBox[List["Sin", "[", RowBox[List["a_", " ", SuperscriptBox["z_", "r_"]]], "]"]]]], ",", "z_"]], "]"]], "]"]], "\[RuleDelayed]", RowBox[List["a", " ", "r", " ", SuperscriptBox["z", RowBox[List[RowBox[List["-", "1"]], "+", "r", "+", RowBox[List["2", " ", "s"]]]]]]]]]]]

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

 2007-05-02