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## Main Question or Discussion Point

I am integrating the below:

\begin{equation}

\psi(r,v)=\int \left( \frac{\frac{\partial M(r,v)}{\partial r}}{r-2M(r,v)}\right)dr

\end{equation}

I am trying to write ψ in terms of M.

Please, any assistance will be appreciated.

\begin{equation}

\psi(r,v)=\int \left( \frac{\frac{\partial M(r,v)}{\partial r}}{r-2M(r,v)}\right)dr

\end{equation}

I am trying to write ψ in terms of M.

Please, any assistance will be appreciated.

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