Find the Exact Value by Using a Half-Angle Identity $\frac { 1 } { 2 } \sqrt { 2 - \sqrt { 2 } }$

question 15

Multiple Choice

Find the exact value by using a half-angle identity.
-cos 22.5°

• 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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