D[Sqrt[b + c z^2], {z, n}] == 2^n (c z)^n (b + c z^2)^(1/2 - n) Pochhammer[3/2 - n, n] Hypergeometric2F1[-(n/2), (1 - n)/2, 3/2 - n, 1 + b/(c z^2)] /; Element[n, Integers] && n >= 0

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2007-05-02