For each of the following angles (in radian measure), find the cosine of the angle.
Note: Your answer must be in EXACT form: it cannot contain trig functions, it must be either an integer or a fraction. If the answer involves a square root write it as sqrt . For instance, the square root of 2 should be written as sqrt(2).

$\frac { \pi } {6}$
$\frac { \pi } {4}$
$\frac {\pi } {3}$
$\frac {\pi } {2}$
$\pi$
$2\pi$

Your overall score for this problem is