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   http://functions.wolfram.com/07.44.20.0008.01
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    D[WhittakerM[\[Nu], \[Mu], z], {z, 4}] == 
 (1/(16 z^4)) ((z^4 - 8 z^3 \[Nu] - 8 z (1 + \[Nu]) 
      (-1 + 4 \[Mu]^2 + 4 \[Nu]) + (-1 + 4 \[Mu]^2) 
      (23 + 4 \[Mu]^2 + 16 \[Nu]) + 2 z^2 (-1 + 4 \[Mu]^2 + 8 \[Nu] + 
       8 \[Nu]^2)) WhittakerM[\[Nu], \[Mu], z] - 8 (1 + 2 \[Mu] + 2 \[Nu]) 
    (-1 + 4 \[Mu]^2 - 2 z \[Nu]) WhittakerM[1 + \[Nu], \[Mu], z]) 
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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>  <mfrac>  <mrow>  <msup>  <mo> ∂ </mo>  <mn> 4 </mn>  </msup>  <mrow>  <msub>  <semantics>  <mi> M </mi>  <annotation encoding='Mathematica'> TagBox["M", WhittakerM] </annotation>  </semantics>  <mrow>  <mi> ν </mi>  <mo> , </mo>  <mi> μ </mi>  </mrow>  </msub>  <mo> ( </mo>  <mi> z </mi>  <mo> ) </mo>  </mrow>  </mrow>  <mrow>  <mo> ∂ </mo>  <msup>  <mi> z </mi>  <mn> 4 </mn>  </msup>  </mrow>  </mfrac>  <mo>  </mo>  <mrow>  <mfrac>  <mn> 1 </mn>  <mrow>  <mn> 16 </mn>  <mo> ⁢ </mo>  <msup>  <mi> z </mi>  <mn> 4 </mn>  </msup>  </mrow>  </mfrac>  <mo> ⁢ </mo>  <mrow>  <mo> ( </mo>  <mrow>  <mrow>  <mrow>  <mo> ( </mo>  <mrow>  <msup>  <mi> z </mi>  <mn> 4 </mn>  </msup>  <mo> - </mo>  <mrow>  <mn> 8 </mn>  <mo> ⁢ </mo>  <mi> ν </mi>  <mo> ⁢ </mo>  <msup>  <mi> z </mi>  <mn> 3 </mn>  </msup>  </mrow>  <mo> + </mo>  <mrow>  <mn> 2 </mn>  <mo> ⁢ </mo>  <mrow>  <mo> ( </mo>  <mrow>  <mrow>  <mn> 4 </mn>  <mo> ⁢ </mo>  <msup>  <mi> μ </mi>  <mn> 2 </mn>  </msup>  </mrow>  <mo> + </mo>  <mrow>  <mn> 8 </mn>  <mo> ⁢ </mo>  <msup>  <mi> ν </mi>  <mn> 2 </mn>  </msup>  </mrow>  <mo> + </mo>  <mrow>  <mn> 8 </mn>  <mo> ⁢ </mo>  <mi> ν </mi>  </mrow>  <mo> - </mo>  <mn> 1 </mn>  </mrow>  <mo> ) </mo>  </mrow>  <mo> ⁢ </mo>  <msup>  <mi> z </mi>  <mn> 2 </mn>  </msup>  </mrow>  <mo> - </mo>  <mrow>  <mn> 8 </mn>  <mo> ⁢ </mo>  <mrow>  <mo> ( </mo>  <mrow>  <mi> ν </mi>  <mo> + </mo>  <mn> 1 </mn>  </mrow>  <mo> ) </mo>  </mrow>  <mo> ⁢ </mo>  <mrow>  <mo> ( </mo>  <mrow>  <mrow>  <mn> 4 </mn>  <mo> ⁢ </mo>  <msup>  <mi> μ </mi>  <mn> 2 </mn>  </msup>  </mrow>  <mo> + </mo>  <mrow>  <mn> 4 </mn>  <mo> ⁢ </mo>  <mi> ν </mi>  </mrow>  <mo> - </mo>  <mn> 1 </mn>  </mrow>  <mo> ) </mo>  </mrow>  <mo> ⁢ </mo>  <mi> z </mi>  </mrow>  <mo> + </mo>  <mrow>  <mrow>  <mo> ( </mo>  <mrow>  <mrow>  <mn> 4 </mn>  <mo> ⁢ </mo>  <msup>  <mi> μ </mi>  <mn> 2 </mn>  </msup>  </mrow>  <mo> - </mo>  <mn> 1 </mn>  </mrow>  <mo> ) </mo>  </mrow>  <mo> ⁢ </mo>  <mrow>  <mo> ( </mo>  <mrow>  <mrow>  <mn> 4 </mn>  <mo> ⁢ </mo>  <msup>  <mi> μ </mi>  <mn> 2 </mn>  </msup>  </mrow>  <mo> + </mo>  <mrow>  <mn> 16 </mn>  <mo> ⁢ </mo>  <mi> ν </mi>  </mrow>  <mo> + </mo>  <mn> 23 </mn>  </mrow>  <mo> ) </mo>  </mrow>  </mrow>  </mrow>  <mo> ) </mo>  </mrow>  <mo> ⁢ </mo>  <mrow>  <msub>  <semantics>  <mi> M </mi>  <annotation encoding='Mathematica'> TagBox["M", WhittakerM] </annotation>  </semantics>  <mrow>  <mi> ν </mi>  <mo> , </mo>  <mi> μ </mi>  </mrow>  </msub>  <mo> ( </mo>  <mi> z </mi>  <mo> ) </mo>  </mrow>  </mrow>  <mo> - </mo>  <mrow>  <mn> 8 </mn>  <mo> ⁢ </mo>  <mrow>  <mo> ( </mo>  <mrow>  <mrow>  <mn> 2 </mn>  <mo> ⁢ </mo>  <mi> μ </mi>  </mrow>  <mo> + </mo>  <mrow>  <mn> 2 </mn>  <mo> ⁢ </mo>  <mi> ν </mi>  </mrow>  <mo> + </mo>  <mn> 1 </mn>  </mrow>  <mo> ) </mo>  </mrow>  <mo> ⁢ </mo>  <mrow>  <mo> ( </mo>  <mrow>  <mrow>  <mn> 4 </mn>  <mo> ⁢ </mo>  <msup>  <mi> μ </mi>  <mn> 2 </mn>  </msup>  </mrow>  <mo> - </mo>  <mrow>  <mn> 2 </mn>  <mo> ⁢ </mo>  <mi> z </mi>  <mo> ⁢ </mo>  <mi> ν </mi>  </mrow>  <mo> - </mo>  <mn> 1 </mn>  </mrow>  <mo> ) </mo>  </mrow>  <mo> ⁢ </mo>  <mrow>  <msub>  <semantics>  <mi> M </mi>  <annotation encoding='Mathematica'> TagBox["M", WhittakerM] </annotation>  </semantics>  <mrow>  <mrow>  <mi> ν </mi>  <mo> + </mo>  <mn> 1 </mn>  </mrow>  <mo> , </mo>  <mi> μ </mi>  </mrow>  </msub>  <mo> ( </mo>  <mi> z </mi>  <mo> ) </mo>  </mrow>  </mrow>  </mrow>  <mo> ) </mo>  </mrow>  </mrow>  </mrow>  <annotation-xml encoding='MathML-Content'>  <apply>  <eq />  <apply>  <partialdiff />  <bvar>  <ci> z </ci>  <degree>  <cn type='integer'> 4 </cn>  </degree>  </bvar>  <apply>  <ci> WhittakerM </ci>  <ci> ν </ci>  <ci> μ </ci>  <ci> z </ci>  </apply>  </apply>  <apply>  <times />  <apply>  <times />  <cn type='integer'> 1 </cn>  <apply>  <power />  <apply>  <times />  <cn type='integer'> 16 </cn>  <apply>  <power />  <ci> z </ci>  <cn type='integer'> 4 </cn>  </apply>  </apply>  <cn type='integer'> -1 </cn>  </apply>  </apply>  <apply>  <plus />  <apply>  <times />  <apply>  <plus />  <apply>  <power />  <ci> z </ci>  <cn type='integer'> 4 </cn>  </apply>  <apply>  <times />  <cn type='integer'> -1 </cn>  <apply>  <times />  <cn type='integer'> 8 </cn>  <ci> ν </ci>  <apply>  <power />  <ci> z </ci>  <cn type='integer'> 3 </cn>  </apply>  </apply>  </apply>  <apply>  <times />  <cn type='integer'> 2 </cn>  <apply>  <plus />  <apply>  <times />  <cn type='integer'> 4 </cn>  <apply>  <power />  <ci> μ </ci>  <cn type='integer'> 2 </cn>  </apply>  </apply>  <apply>  <times />  <cn type='integer'> 8 </cn>  <apply>  <power />  <ci> ν </ci>  <cn type='integer'> 2 </cn>  </apply>  </apply>  <apply>  <times />  <cn type='integer'> 8 </cn>  <ci> ν </ci>  </apply>  <cn type='integer'> -1 </cn>  </apply>  <apply>  <power />  <ci> z </ci>  <cn type='integer'> 2 </cn>  </apply>  </apply>  <apply>  <times />  <cn type='integer'> -1 </cn>  <apply>  <times />  <cn type='integer'> 8 </cn>  <apply>  <plus />  <ci> ν </ci>  <cn type='integer'> 1 </cn>  </apply>  <apply>  <plus />  <apply>  <times />  <cn type='integer'> 4 </cn>  <apply>  <power />  <ci> μ </ci>  <cn type='integer'> 2 </cn>  </apply>  </apply>  <apply>  <times />  <cn type='integer'> 4 </cn>  <ci> ν </ci>  </apply>  <cn type='integer'> -1 </cn>  </apply>  <ci> z </ci>  </apply>  </apply>  <apply>  <times />  <apply>  <plus />  <apply>  <times />  <cn type='integer'> 4 </cn>  <apply>  <power />  <ci> μ </ci>  <cn type='integer'> 2 </cn>  </apply>  </apply>  <cn type='integer'> -1 </cn>  </apply>  <apply>  <plus />  <apply>  <times />  <cn type='integer'> 4 </cn>  <apply>  <power />  <ci> μ </ci>  <cn type='integer'> 2 </cn>  </apply>  </apply>  <apply>  <times />  <cn type='integer'> 16 </cn>  <ci> ν </ci>  </apply>  <cn type='integer'> 23 </cn>  </apply>  </apply>  </apply>  <apply>  <ci> WhittakerM </ci>  <ci> ν </ci>  <ci> μ </ci>  <ci> z </ci>  </apply>  </apply>  <apply>  <times />  <cn type='integer'> -1 </cn>  <apply>  <times />  <cn type='integer'> 8 </cn>  <apply>  <plus />  <apply>  <times />  <cn type='integer'> 2 </cn>  <ci> μ </ci>  </apply>  <apply>  <times />  <cn type='integer'> 2 </cn>  <ci> ν </ci>  </apply>  <cn type='integer'> 1 </cn>  </apply>  <apply>  <plus />  <apply>  <times />  <cn type='integer'> 4 </cn>  <apply>  <power />  <ci> μ </ci>  <cn type='integer'> 2 </cn>  </apply>  </apply>  <apply>  <times />  <cn type='integer'> -1 </cn>  <apply>  <times />  <cn type='integer'> 2 </cn>  <ci> z </ci>  <ci> ν </ci>  </apply>  </apply>  <cn type='integer'> -1 </cn>  </apply>  <apply>  <ci> WhittakerM </ci>  <apply>  <plus />  <ci> ν </ci>  <cn type='integer'> 1 </cn>  </apply>  <ci> μ </ci>  <ci> z </ci>  </apply>  </apply>  </apply>  </apply>  </apply>  </apply>  </annotation-xml>  </semantics>  </math> 
   
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  | Cell[BoxData[RowBox[List[RowBox[List["HoldPattern", "[", RowBox[List[SubscriptBox["\[PartialD]", RowBox[List[RowBox[List["{", RowBox[List["z_", ",", "4"]], "}"]]]]], RowBox[List["WhittakerM", "[", RowBox[List["\[Nu]_", ",", "\[Mu]_", ",", "z_"]], "]"]]]], "]"]], "\[RuleDelayed]", FractionBox[RowBox[List[RowBox[List[RowBox[List["(", RowBox[List[SuperscriptBox["z", "4"], "-", RowBox[List["8", " ", SuperscriptBox["z", "3"], " ", "\[Nu]"]], "-", RowBox[List["8", " ", "z", " ", RowBox[List["(", RowBox[List["1", "+", "\[Nu]"]], ")"]], " ", RowBox[List["(", RowBox[List[RowBox[List["-", "1"]], "+", RowBox[List["4", " ", SuperscriptBox["\[Mu]", "2"]]], "+", RowBox[List["4", " ", "\[Nu]"]]]], ")"]]]], "+", RowBox[List[RowBox[List["(", RowBox[List[RowBox[List["-", "1"]], "+", RowBox[List["4", " ", SuperscriptBox["\[Mu]", "2"]]]]], ")"]], " ", RowBox[List["(", RowBox[List["23", "+", RowBox[List["4", " ", SuperscriptBox["\[Mu]", "2"]]], "+", RowBox[List["16", " ", "\[Nu]"]]]], ")"]]]], "+", RowBox[List["2", " ", SuperscriptBox["z", "2"], " ", RowBox[List["(", RowBox[List[RowBox[List["-", "1"]], "+", RowBox[List["4", " ", SuperscriptBox["\[Mu]", "2"]]], "+", RowBox[List["8", " ", "\[Nu]"]], "+", RowBox[List["8", " ", SuperscriptBox["\[Nu]", "2"]]]]], ")"]]]]]], ")"]], " ", RowBox[List["WhittakerM", "[", RowBox[List["\[Nu]", ",", "\[Mu]", ",", "z"]], "]"]]]], "-", RowBox[List["8", " ", RowBox[List["(", RowBox[List["1", "+", RowBox[List["2", " ", "\[Mu]"]], "+", RowBox[List["2", " ", "\[Nu]"]]]], ")"]], " ", RowBox[List["(", RowBox[List[RowBox[List["-", "1"]], "+", RowBox[List["4", " ", SuperscriptBox["\[Mu]", "2"]]], "-", RowBox[List["2", " ", "z", " ", "\[Nu]"]]]], ")"]], " ", RowBox[List["WhittakerM", "[", RowBox[List[RowBox[List["1", "+", "\[Nu]"]], ",", "\[Mu]", ",", "z"]], "]"]]]]]], RowBox[List["16", " ", SuperscriptBox["z", "4"]]]]]]]]  |  
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