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

Question

Quizplus · Accepted Answer

The expression $\sqrt { \frac { 1 + \cos 22 ^ { \circ } } { 2 } }$ is derived from the half-angle identity for cosine, which is $\cos \frac{\theta}{2} = \sqrt { \frac { 1 + \cos \theta } { 2 } }$. Applying this identity with $\theta = 22^\circ$, we get $\cos 11^\circ$.

Use an Identity to Write the Expression as a Single 1+cos⁡22∘2\sqrt { \frac { 1 + \cos 22 ^ { \circ } } { 2 } }21+cos22∘​​

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