The circle with a radius of one unit is partitioned into twelve equal arcs, where each arc corresponds to specific $t$-values. Determine the value of each trigonometric function at the given real number $t$ using the $(x,y)$ coordinates in the diagram or specify that the expression is undefined.

$\sin \frac{\pi }{6}$

• A. $\frac{\sqrt3}{2}$
• B. $\frac12$
• C. $-\frac{\sqrt2}{2}$
• D. Undefined

Answer: (B)