Trigonometry
Determine the exact value of the following trigonometric function without using a calculator.
cos(−75°)\cos\left(-75\degree\right)cos(−75°)
6−24\frac{\sqrt6-\sqrt2}{4}46−2
6+24\frac{\sqrt6+\sqrt2}{4}46+2
6−22\frac{\sqrt6-\sqrt2}{2}26−2
2−64\frac{\sqrt2-\sqrt6}{4}42−6