What is the exact value of cos(15∘)\cos(15^\circ)cos(15∘)?
6−24\frac{\sqrt{6} - \sqrt{2}}{4}46−2
3+12\frac{\sqrt{3} + 1}{2}23+1
6+24\frac{\sqrt{6} + \sqrt{2}}{4}46+2
2+12\frac{\sqrt{2} + 1}{2}22+1