Use the Half-Angle Formulas
- $\cos \frac { 3 \pi } { 8 }$

question 208

Multiple Choice

Use The Half-Angle Formulas
- $\cos \frac { 3 \pi } { 8 }$

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

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