D[CoshIntegral[z], {z, n}] == ((-1)^(n - 1) (n - 1)!)/z^n + 2^(n - 3) Sqrt[Pi] z^(2 - n) HypergeometricPFQRegularized[{1, 1}, {2, (3 - n)/2, 2 - n/2}, z^2/4] /; Element[n, Integers] && n > 0

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2001-10-29