D[Beta[Subscript[z, 1], Subscript[z, 2], a, b], {Subscript[z, 2], 2}] == (1 - Subscript[z, 2])^(-2 + b) Subscript[z, 2]^(-2 + a) (a - 1 - (a + b - 2) Subscript[z, 2])

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2001-10-29