The value of $ \cos^2 45^\circ - \sin^2 15^\circ $ is

Question

The value of $ \cos^2 45^\circ - \sin^2 15^\circ $ is –

$ \frac{\sqrt{3}}{2} $

$ \frac{\sqrt{3}}{4} $

$ \frac{\sqrt{3} + 1}{2\sqrt{2}} $

$ \frac{\sqrt{3} - 1}{2\sqrt{2}} $

Please login to view the detailed solution steps...