Trigonometry
Without using a calculator, determine the exact value of the expression.
cos(csc−1(−2))\cos\left(\csc^{-1}\left(-\sqrt2\right)\right)cos(csc−1(−2))
22\frac{\sqrt2}{2}22
−22-\frac{\sqrt2}{2}−22
12\frac1221
32\frac{\sqrt3}{2}23