Use an Identity to Write the Expression as a Single $$\sqrt { \frac { 1 + \cos 22 ^ { \circ } } { 2 } }$$

Multiple Choice

Use an identity to write the expression as a single trigonometric function or as a single number.
- $$\sqrt { \frac { 1 + \cos 22 ^ { \circ } } { 2 } }$$

A) $\tan 11 ^ { \circ }$
B) $\sin 11 ^ { \circ }$
C) $\cot 11 ^ { \circ }$
D) $\cos 11 ^ { \circ }$