Find the Point $( x , y )$ On the Unit Circle That Corresponds to the Real Number

Multiple Choice

Find the point $( x , y )$ on the unit circle that corresponds to the real number $t = - \frac { \pi } { 6 }$ .Use your results to evaluate cos t.

A) cos t = 1
B) cos t = -1
C) $\cos t = - \frac { \sqrt { 3 } } { 2 }$
D) $\cos t = \frac { \sqrt { 3 } } { 2 }$
E) $\cos t = \frac { 1 } { 2 }$