Trigonometry
Determine the exact value of the following trigonometric function without using a calculator.
cos(−11π12)\cos\left(-\frac{11\pi}{12}\right)cos(−1211π)
6−24\frac{\sqrt6-\sqrt2}{4}46−2
−2−64\frac{-\sqrt2-\sqrt6}{4}4−2−6
6−22\frac{\sqrt6-\sqrt2}{2}26−2
−2−62\frac{-\sqrt2-\sqrt6}{2}2−2−6