BernardK
Programming Ruby 3.2 (5th Edition): B4.0 page 502, atanh
page 502, in Math, last bullet, line 4 : atanh should be Math.atanh
hyperbolic functions Math.cosh, Math.sinh, Math.tanh, Math.acosh, Math.asinh, and atanh are
-----> ^ Math.atanh
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