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Consider [tex] x \in (0,1) [/tex], that is x between 0 and 1. Can someone explain why the following is true:

[tex]\frac{x-1}{x+1} = \tanh \left( \ln \left( \frac{x}{2} \right) \right)[/tex]

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# The relation between the natural log composed with hyperbolic tangent and this ratio

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