Find the exact value of cos75°\cos 75°cos75°.
6−24\dfrac{\sqrt{6}-\sqrt{2}}{4}46−2
6+24\dfrac{\sqrt{6}+\sqrt{2}}{4}46+2
3−14\dfrac{\sqrt{3}-1}{4}43−1
2−34\dfrac{\sqrt{2}-\sqrt{3}}{4}42−3