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

Question 317

Multiple Choice

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


A) 2−64\frac { \sqrt { 2 } - \sqrt { 6 } } { 4 }
B) 6−24\frac { \sqrt { 6 } - \sqrt { 2 } } { 4 }
C) 6+24\frac { \sqrt { 6 } + \sqrt { 2 } } { 4 }
D) −6−24\frac { - \sqrt { 6 } - \sqrt { 2 } } { 4 }

Correct Answer:

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