Question
$\tan^{-1}\left[\frac{1}{\sqrt{3}} \sin\left(\frac{5\pi}{2}\right) \sin^{-1}\left(\cos\left(\sin^{-1}\frac{\sqrt{3}}{2}\right)\right)\right] =$
$\tan^{-1}\left[\frac{1}{\sqrt{3}} \sin\left(\frac{5\pi}{2}\right) \sin^{-1}\left(\cos\left(\sin^{-1}\frac{\sqrt{3}}{2}\right)\right)\right] =$