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 ArcTan

 http://functions.wolfram.com/01.14.16.0190.01

 Input Form

 a ArcTan[x] + b ArcTan[y] == a Pi Floor[(-Arg[1 - I x] + Arg[I x + 1] + Pi)/(2 Pi)] - 2 I Pi (Floor[(-Arg[((1 - I x)/(I x + 1))^((I a)/2)] - Arg[(1 - I y)^((I b)/2)] + Pi)/(2 Pi)] + Floor[(Pi - (1/2) Re[a Log[(1 - I x)/(I x + 1)]])/(2 Pi)] + Floor[(Pi - (1/2) Re[b Log[1 - I y]])/(2 Pi)]) - 2 I Pi (Floor[(-Arg[((1 - I x)/(I x + 1))^((I a)/2) (1 - I y)^((I b)/2)] - Arg[(I y + 1)^((-(1/2)) (I b))] + Pi)/(2 Pi)] + Floor[(Pi - Im[Log[((1 - I x)/(I x + 1))^((I a)/2) (1 - I y)^((I b)/2)]])/ (2 Pi)] + Floor[((1/2) Re[b Log[I y + 1]] + Pi)/(2 Pi)]) + Log[(((1 - I x)/(I x + 1))^((I a)/2) (1 - I y)^((I b)/2))/ (I y + 1)^((1/2) (I b))]

 Standard Form

 Cell[BoxData[RowBox[List[" ", RowBox[List[RowBox[List[RowBox[List["a", " ", RowBox[List["ArcTan", "[", "x", "]"]]]], "+", RowBox[List["b", " ", RowBox[List["ArcTan", "[", "y", "]"]]]]]], "\[Equal]", RowBox[List[RowBox[List["a", " ", "\[Pi]", " ", RowBox[List["Floor", "[", FractionBox[RowBox[List[RowBox[List["-", RowBox[List["Arg", "[", RowBox[List["1", "-", RowBox[List["\[ImaginaryI]", " ", "x"]]]], "]"]]]], "+", RowBox[List["Arg", "[", RowBox[List[RowBox[List["\[ImaginaryI]", " ", "x"]], "+", "1"]], "]"]], "+", "\[Pi]"]], RowBox[List["2", " ", "\[Pi]"]]], "]"]]]], "-", RowBox[List["2", " ", "\[ImaginaryI]", " ", "\[Pi]", " ", RowBox[List["(", RowBox[List[RowBox[List["Floor", "[", FractionBox[RowBox[List[RowBox[List["-", RowBox[List["Arg", "[", SuperscriptBox[RowBox[List["(", FractionBox[RowBox[List["1", "-", RowBox[List["\[ImaginaryI]", " ", "x"]]]], RowBox[List[RowBox[List["\[ImaginaryI]", " ", "x"]], "+", "1"]]], ")"]], FractionBox[RowBox[List["\[ImaginaryI]", " ", "a"]], "2"]], "]"]]]], "-", RowBox[List["Arg", "[", SuperscriptBox[RowBox[List["(", RowBox[List["1", "-", RowBox[List["\[ImaginaryI]", " ", "y"]]]], ")"]], FractionBox[RowBox[List["\[ImaginaryI]", " ", "b"]], "2"]], "]"]], "+", "\[Pi]"]], RowBox[List["2", " ", "\[Pi]"]]], "]"]], "+", RowBox[List["Floor", "[", FractionBox[RowBox[List["\[Pi]", "-", RowBox[List[FractionBox["1", "2"], " ", RowBox[List["Re", "[", RowBox[List["a", " ", RowBox[List["Log", "[", FractionBox[RowBox[List["1", "-", RowBox[List["\[ImaginaryI]", " ", "x"]]]], RowBox[List[RowBox[List["\[ImaginaryI]", " ", "x"]], "+", "1"]]], "]"]]]], "]"]]]]]], RowBox[List["2", " ", "\[Pi]"]]], "]"]], "+", RowBox[List["Floor", "[", FractionBox[RowBox[List["\[Pi]", "-", RowBox[List[FractionBox["1", "2"], " ", RowBox[List["Re", "[", RowBox[List["b", " ", RowBox[List["Log", "[", RowBox[List["1", "-", RowBox[List["\[ImaginaryI]", " ", "y"]]]], "]"]]]], "]"]]]]]], RowBox[List["2", " ", "\[Pi]"]]], "]"]]]], ")"]]]], "-", RowBox[List["2", " ", "\[ImaginaryI]", " ", "\[Pi]", " ", RowBox[List["(", RowBox[List[RowBox[List["Floor", "[", FractionBox[RowBox[List[RowBox[List["-", RowBox[List["Arg", "[", RowBox[List[SuperscriptBox[RowBox[List["(", FractionBox[RowBox[List["1", "-", RowBox[List["\[ImaginaryI]", " ", "x"]]]], RowBox[List[RowBox[List["\[ImaginaryI]", " ", "x"]], "+", "1"]]], ")"]], FractionBox[RowBox[List["\[ImaginaryI]", " ", "a"]], "2"]], " ", SuperscriptBox[RowBox[List["(", RowBox[List["1", "-", RowBox[List["\[ImaginaryI]", " ", "y"]]]], ")"]], FractionBox[RowBox[List["\[ImaginaryI]", " ", "b"]], "2"]]]], "]"]]]], "-", RowBox[List["Arg", "[", SuperscriptBox[RowBox[List["(", RowBox[List[RowBox[List["\[ImaginaryI]", " ", "y"]], "+", "1"]], ")"]], RowBox[List[RowBox[List["-", FractionBox["1", "2"]]], " ", RowBox[List["(", RowBox[List["\[ImaginaryI]", " ", "b"]], ")"]]]]], "]"]], "+", "\[Pi]"]], RowBox[List["2", " ", "\[Pi]"]]], "]"]], "+", RowBox[List["Floor", "[", FractionBox[RowBox[List["\[Pi]", "-", RowBox[List["Im", "[", RowBox[List["Log", "[", RowBox[List[SuperscriptBox[RowBox[List["(", FractionBox[RowBox[List["1", "-", RowBox[List["\[ImaginaryI]", " ", "x"]]]], RowBox[List[RowBox[List["\[ImaginaryI]", " ", "x"]], "+", "1"]]], ")"]], FractionBox[RowBox[List["\[ImaginaryI]", " ", "a"]], "2"]], " ", SuperscriptBox[RowBox[List["(", RowBox[List["1", "-", RowBox[List["\[ImaginaryI]", " ", "y"]]]], ")"]], FractionBox[RowBox[List["\[ImaginaryI]", " ", "b"]], "2"]]]], "]"]], "]"]]]], RowBox[List["2", " ", "\[Pi]"]]], "]"]], "+", RowBox[List["Floor", "[", FractionBox[RowBox[List[RowBox[List[FractionBox["1", "2"], " ", RowBox[List["Re", "[", RowBox[List["b", " ", RowBox[List["Log", "[", RowBox[List[RowBox[List["\[ImaginaryI]", " ", "y"]], "+", "1"]], "]"]]]], "]"]]]], "+", "\[Pi]"]], RowBox[List["2", " ", "\[Pi]"]]], "]"]]]], ")"]]]], "+", RowBox[List["Log", "[", RowBox[List[SuperscriptBox[RowBox[List["(", FractionBox[RowBox[List["1", "-", RowBox[List["\[ImaginaryI]", " ", "x"]]]], RowBox[List[RowBox[List["\[ImaginaryI]", " ", "x"]], "+", "1"]]], ")"]], FractionBox[RowBox[List["\[ImaginaryI]", " ", "a"]], "2"]], " ", SuperscriptBox[RowBox[List["(", RowBox[List["1", "-", RowBox[List["\[ImaginaryI]", " ", "y"]]]], ")"]], FractionBox[RowBox[List["\[ImaginaryI]", " ", "b"]], "2"]], " ", SuperscriptBox[RowBox[List["(", RowBox[List[RowBox[List["\[ImaginaryI]", " ", "y"]], "+", "1"]], ")"]], RowBox[List[RowBox[List["-", FractionBox["1", "2"]]], " ", RowBox[List["(", RowBox[List["\[ImaginaryI]", " ", "b"]], ")"]]]]]]], "]"]]]]]]]]]]

 MathML Form

 a tan - 1 ( x ) + b tan - 1 ( y ) a π arg ( x + 1 ) - arg ( 1 - x ) + π 2 π - 2 π ( - arg ( ( y + 1 ) - 1 2 ( b ) ) - arg ( ( 1 - x x + 1 ) a 2 ( 1 - y ) b 2 ) + π 2 π + 1 2 Re ( b log ( y + 1 ) ) + π 2 π + π - Im ( log ( ( 1 - x x + 1 ) a 2 ( 1 - y ) b 2 ) ) 2 π ) - 2 π ( - arg ( ( 1 - x x + 1 ) a 2 ) - arg ( ( 1 - y ) b 2 ) + π 2 π + π - 1 2 Re ( a log ( 1 - x x + 1 ) ) 2 π + π - 1 2 Re ( b log ( 1 - y ) ) 2 π ) + log ( ( 1 - x x + 1 ) a 2 ( 1 - y ) b 2 ( y + 1 ) - 1 2 ( b ) ) a x b y a x 1 -1 1 -1 x 2 -1 -1 2 -1 y 1 -1 1 2 b -1 1 -1 x x 1 -1 a 2 -1 1 -1 y b 2 -1 2 -1 1 2 b y 1 2 -1 -1 1 -1 x x 1 -1 a 2 -1 1 -1 y b 2 -1 2 -1 -1 2 -1 1 -1 x x 1 -1 a 2 -1 -1 1 -1 y b 2 -1 2 -1 -1 1 2 a 1 -1 x x 1 -1 2 -1 -1 1 2 b 1 -1 y 2 -1 1 -1 x x 1 -1 a 2 -1 1 -1 y b 2 -1 y 1 -1 1 2 b [/itex]

 Rule Form

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

 2007-05-02