Use Identities to Find the Exact Value $\cos 165 ^ { \circ }$

question 317

Multiple Choice

Use Identities to find the exact value.
- $\cos 165 ^ { \circ }$

• A) \(\frac { \sqrt { 2 } - \sqrt { 6 } } { 4 }\)
• B) \(\frac { \sqrt { 6 } - \sqrt { 2 } } { 4 }\)
• C) \(\frac { \sqrt { 6 } + \sqrt { 2 } } { 4 }\)
• D) \(\frac { - \sqrt { 6 } - \sqrt { 2 } } { 4 }\)