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 Power

 http://functions.wolfram.com/01.02.16.0128.01

 Input Form

 z^a - (-z)^a == 2 z (-z^2)^((a - 1)/2) Sin[(a Pi)/2]

 Standard Form

 Cell[BoxData[RowBox[List[RowBox[List[SuperscriptBox["z", "a"], "-", SuperscriptBox[RowBox[List["(", RowBox[List["-", "z"]], ")"]], "a"]]], " ", "\[Equal]", RowBox[List["2", " ", "z", " ", SuperscriptBox[RowBox[List["(", RowBox[List["-", SuperscriptBox["z", "2"]]], ")"]], FractionBox[RowBox[List["a", "-", "1"]], "2"]], " ", RowBox[List["Sin", "[", FractionBox[RowBox[List["a", " ", "\[Pi]"]], "2"], "]"]]]]]]]]

 MathML Form

 z a - ( - z ) a 2 z ( - z 2 ) a - 1 2 sin ( a π 2 ) z a -1 -1 z a 2 z -1 z 2 a -1 2 -1 a 2 -1 [/itex]

 Rule Form

 Cell[BoxData[RowBox[List[RowBox[List["HoldPattern", "[", RowBox[List[SuperscriptBox["z_", "a_"], "-", SuperscriptBox[RowBox[List["(", RowBox[List["-", "z_"]], ")"]], "a_"]]], "]"]], "\[RuleDelayed]", RowBox[List["2", " ", "z", " ", SuperscriptBox[RowBox[List["(", RowBox[List["-", SuperscriptBox["z", "2"]]], ")"]], FractionBox[RowBox[List["a", "-", "1"]], "2"]], " ", RowBox[List["Sin", "[", FractionBox[RowBox[List["a", " ", "\[Pi]"]], "2"], "]"]]]]]]]]

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

 2007-05-02