Halving An Angle Many Times
Geometry
Level
3
\[\large (\color{red}{\sin 15^\circ} - \color{blue}{2\sin^2 7.5^\circ})(\color{red}{\sin 15^\circ} + \color{blue}{2\cos^2 7.5^\circ})= \, ?\]
by
Nihar Mahajan