## Precalculus (6th Edition) Blitzer

1 + $cot^{2}x$ = $csc^{2}x$ for all x $csc^{2}x$ - $cot^{2}x$ = 1 for all x. So for x = $\frac{\pi}{6}$, $csc^{2}\frac{\pi}{6}$ - $cot^{2}\frac{\pi}{6}$ = 1.