Inverse hyperbolic functions and their logarithmic forms

A proof and disussion of the logarithmic form of the inverse hyperbolic cosine, cosh. The equivalent results for inverse sinh and tanh are also stated.

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[victorraulh]

The range of cosh inverse is [0, ∞), so only the plus sign must be considered.

[dorineeboulesimoko]

Taking the square root of 4, why does the square root does not desappear??