Mathematics

Problem

\tan^{-1} x + \tan^{-1} \frac{\sqrt{1-y^2}}{y} = \frac{\pi}{3}

and

\sin^{-1} y - \cos^{-1}\left(\frac{x}{\sqrt{1+x^2}}\right) = \frac{\pi}{6}, \text{ then } \frac{5 \sin^{-1} x}{\sin^{-1} y} \text{ is}