Sorry I'm new here so I don't know how to use the math symbols yet but I would really appreciate some help with something I'm stuck on.
How can this equation:
$$ ()= \sinh(\sinh^{-1}(_0)−\rho \log) $$
Be reformulated as:
$$ y(x)=\frac{x}{2}\left(\sqrt{1+y_0^2}\left(x^{-\rho}-x^\rho\right)+y_0\left(x^{-\rho}+x^\rho\right)\right) $$
It is a step that wasn't explained by user26872 in his reponse to the following question: Name that curve!
Thank you!