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   http://functions.wolfram.com/05.07.03.0001.01
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    LegendreP[n, \[Mu], 2, 0] == (2^\[Mu] Sqrt[Pi])/
  (Gamma[(1 - \[Mu] - n)/2] Gamma[1 - (\[Mu] - n)/2]) 
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   Cell[BoxData[RowBox[List[RowBox[List["LegendreP", "[", RowBox[List["n", ",", "\[Mu]", ",", "2", ",", "0"]], "]"]], "\[Equal]", FractionBox[RowBox[List[SuperscriptBox["2", "\[Mu]"], " ", SqrtBox["\[Pi]"]]], RowBox[List[RowBox[List["Gamma", "[", FractionBox[RowBox[List["1", "-", "\[Mu]", "-", "n"]], "2"], "]"]], " ", RowBox[List["Gamma", "[", RowBox[List["1", "-", FractionBox[RowBox[List["\[Mu]", "-", "n"]], "2"]]], "]"]]]]]]]]] 
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   <math xmlns='http://www.w3.org/1998/Math/MathML' mathematica:form='TraditionalForm' xmlns:mathematica='http://www.wolfram.com/XML/'>  <semantics>  <mrow>  <mrow>  <msubsup>  <semantics>  <mi> P </mi>  <annotation encoding='Mathematica'> TagBox["P", LegendreP] </annotation>  </semantics>  <mi> n </mi>  <mi> μ </mi>  </msubsup>  <mo> ( </mo>  <semantics>  <mn> 0 </mn>  <annotation encoding='Mathematica'> TagBox["0", HoldComplete[LegendreP, 2]] </annotation>  </semantics>  <mo> ) </mo>  </mrow>  <mo> ⩵ </mo>  <mfrac>  <mrow>  <msup>  <mn> 2 </mn>  <mi> μ </mi>  </msup>  <mo> ⁢ </mo>  <msqrt>  <mi> π </mi>  </msqrt>  </mrow>  <mrow>  <mrow>  <mi> Γ </mi>  <mo> ⁡ </mo>  <mo> ( </mo>  <mfrac>  <mrow>  <mn> 1 </mn>  <mo> - </mo>  <mi> μ </mi>  <mo> - </mo>  <mi> n </mi>  </mrow>  <mn> 2 </mn>  </mfrac>  <mo> ) </mo>  </mrow>  <mo> ⁢ </mo>  <mrow>  <mi> Γ </mi>  <mo> ⁡ </mo>  <mo> ( </mo>  <mrow>  <mn> 1 </mn>  <mo> - </mo>  <mfrac>  <mrow>  <mi> μ </mi>  <mo> - </mo>  <mi> n </mi>  </mrow>  <mn> 2 </mn>  </mfrac>  </mrow>  <mo> ) </mo>  </mrow>  </mrow>  </mfrac>  </mrow>  <annotation-xml encoding='MathML-Content'>  <apply>  <eq />  <apply>  <ci> LegendreP </ci>  <ci> n </ci>  <ci> μ </ci>  <cn type='integer'> 2 </cn>  <cn type='integer'> 0 </cn>  </apply>  <apply>  <times />  <apply>  <power />  <cn type='integer'> 2 </cn>  <ci> μ </ci>  </apply>  <apply>  <power />  <pi />  <cn type='rational'> 1 <sep /> 2 </cn>  </apply>  <apply>  <power />  <apply>  <times />  <apply>  <ci> Gamma </ci>  <apply>  <times />  <apply>  <plus />  <cn type='integer'> 1 </cn>  <apply>  <times />  <cn type='integer'> -1 </cn>  <ci> μ </ci>  </apply>  <apply>  <times />  <cn type='integer'> -1 </cn>  <ci> n </ci>  </apply>  </apply>  <apply>  <power />  <cn type='integer'> 2 </cn>  <cn type='integer'> -1 </cn>  </apply>  </apply>  </apply>  <apply>  <ci> Gamma </ci>  <apply>  <plus />  <cn type='integer'> 1 </cn>  <apply>  <times />  <cn type='integer'> -1 </cn>  <apply>  <times />  <apply>  <plus />  <ci> μ </ci>  <apply>  <times />  <cn type='integer'> -1 </cn>  <ci> n </ci>  </apply>  </apply>  <apply>  <power />  <cn type='integer'> 2 </cn>  <cn type='integer'> -1 </cn>  </apply>  </apply>  </apply>  </apply>  </apply>  </apply>  <cn type='integer'> -1 </cn>  </apply>  </apply>  </apply>  </annotation-xml>  </semantics>  </math> 
   
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  | Cell[BoxData[RowBox[List[RowBox[List["HoldPattern", "[", RowBox[List["LegendreP", "[", RowBox[List["n_", ",", "\[Mu]_", ",", "2", ",", "0"]], "]"]], "]"]], "\[RuleDelayed]", FractionBox[RowBox[List[SuperscriptBox["2", "\[Mu]"], " ", SqrtBox["\[Pi]"]]], RowBox[List[RowBox[List["Gamma", "[", RowBox[List[FractionBox["1", "2"], " ", RowBox[List["(", RowBox[List["1", "-", "\[Mu]", "-", "n"]], ")"]]]], "]"]], " ", RowBox[List["Gamma", "[", RowBox[List["1", "-", FractionBox[RowBox[List["\[Mu]", "-", "n"]], "2"]]], "]"]]]]]]]]]  |  
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   Date Added to functions.wolfram.com (modification date)
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| LegendreP[n,z] |  | LegendreP[nu,z] |  | LegendreP[nu,mu,z] |  | LegendreP[nu,mu,2,z] |  | LegendreP[nu,mu,3,z] |  |   |  
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