D[GegenbauerC[\[Nu], z], {z, \[Alpha]}] == (((2 Sqrt[Pi])/\[Nu]) HypergeometricPFQRegularized[ {{-\[Nu], \[Nu]}, {1}, {}}, {{1/2}, {1 - \[Alpha]}, {}}, -(z/2), 1/2])/ z^\[Alpha]

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2001-10-29