Find cos(75∘)\cos(75^\circ)cos(75∘).
6−24\frac{\sqrt{6}-\sqrt{2}}{4}46−2
6+24\frac{\sqrt{6}+\sqrt{2}}{4}46+2
3−12\frac{\sqrt{3}-1}{2}23−1
3+12\frac{\sqrt{3}+1}{2}23+1