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http://functions.wolfram.com/01.21.21.0223.01
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Integrate[1/(a + b Tanh[c z])^2, z] ==
(a^2 ((a^2 + b^2) c z - 2 a b Log[a Cosh[c z] + b Sinh[c z]]) +
b ((-a^2) b + b^3 + a^3 c z + a b^2 c z -
2 a^2 b Log[a Cosh[c z] + b Sinh[c z]]) Tanh[c z])/
(a (a - b)^2 (a + b)^2 c (a + b Tanh[c z]))
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Date Added to functions.wolfram.com (modification date)
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