Use Identities to Find the Exact Value $\cos \left( - 165 ^ { \circ } \right)$

question 86

Multiple Choice

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

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

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Definitions:

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