Use an Identity to Write the Expression as a Single $\cos \frac { 5 \pi } { 12 }$

question 79

Multiple Choice

Use an identity to write the expression as a single trigonometric function or as a single number.
- $\cos \frac { 5 \pi } { 12 }$

• A) \(- \frac { 1 } { 2 } \sqrt { 2 - \sqrt { 3 } }\)
• B) \(\frac { 1 } { 2 } \sqrt { 2 + \sqrt { 3 } }\)
• C) \(- \frac { 1 } { 2 } \sqrt { 2 + \sqrt { 3 } }\)
• D) \(\frac { 1 } { 2 } \sqrt { 2 - \sqrt { 3 } }\)

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