Use Identities to Find the Indicated Value for Each Angle $2 \cos ^ { 2 } 22.5 ^ { \circ } - 1$

question 121

Multiple Choice

Use identities to find the indicated value for each angle measure.
- $2 \cos ^ { 2 } 22.5 ^ { \circ } - 1$

• A) \(\frac { \sqrt { 2 } } { 2 }\)
• B) \(\frac { \sqrt { 3 } } { 3 }\)
• C) \(\sqrt { 3 }\)
• D) \(\frac { \sqrt { 2 } } { 4 }\)

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