D[f[Sinh[z]], {z, n}] == (-1)^n Sum[(1/m!) Sum[Binomial[m, j] Sum[((-1)^(j - l) 2^(j - m) Sinh[z]^j (2 l + j - m)^n Binomial[m - j, l] Derivative[m][f][Sinh[z]])/E^((j + 2 l - m) z), {l, 0, m - j}], {j, 0, m - 1}], {m, 1, n}] /; Element[n, Integers] && n > 0

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2001-10-29