I have a measurement from which I want to deduct the value of a physical size (velocity). The theoretical equation is $ A\frac{(b+vt)^2}{(c-vt)^2} $
Where $A$, $b$ and $c$ are all known sizes, $t$ is the time variable and $v$ is the wanted size. Which curve should I approximate the measured data in order to find $v$?