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 ArcCos

 http://functions.wolfram.com/01.13.16.0089.01

 Input Form

 ArcCos[Sqrt[(1 - Sqrt[1 - z^2])/2]] == Pi/4 + ArcCos[z]/2 /; Inequality[-(Pi/2), Less, Arg[z], LessEqual, Pi/2]

 Standard Form

 Cell[BoxData[RowBox[List[RowBox[List[RowBox[List["ArcCos", "[", SqrtBox[RowBox[List[FractionBox[RowBox[List["1", "-", SqrtBox[RowBox[List["1", "-", SuperscriptBox["z", "2"]]]]]], "2"], " "]]], "]"]], "\[Equal]", RowBox[List[FractionBox["\[Pi]", "4"], "+", FractionBox[RowBox[List["ArcCos", "[", "z", "]"]], "2"]]]]], "/;", RowBox[List[RowBox[List["-", FractionBox["\[Pi]", "2"]]], "<", RowBox[List["Arg", "[", "z", "]"]], "\[LessEqual]", FractionBox["\[Pi]", "2"]]]]]]]

 MathML Form

 cos - 1 ( 1 - 1 - z 2 2 ) π 4 + 1 2 cos - 1 ( z ) /; - π 2 < arg ( z ) π 2 Condition 1 -1 1 -1 z 2 1 2 2 -1 1 2 4 -1 1 2 z Inequality -1 2 -1 z 2 -1 [/itex]

 Rule Form

 Cell[BoxData[RowBox[List[RowBox[List["HoldPattern", "[", RowBox[List["ArcCos", "[", SqrtBox[RowBox[List[FractionBox["1", "2"], " ", RowBox[List["(", RowBox[List["1", "-", SqrtBox[RowBox[List["1", "-", SuperscriptBox["z_", "2"]]]]]], ")"]]]]], "]"]], "]"]], "\[RuleDelayed]", RowBox[List[RowBox[List[FractionBox["\[Pi]", "4"], "+", FractionBox[RowBox[List["ArcCos", "[", "z", "]"]], "2"]]], "/;", RowBox[List[RowBox[List["-", FractionBox["\[Pi]", "2"]]], "<", RowBox[List["Arg", "[", "z", "]"]], "\[LessEqual]", FractionBox["\[Pi]", "2"]]]]]]]]]

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

 2003-08-21