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Use an Identity to Write the Expression as a Single 2cos⁡222.5∘−12 \cos ^ { 2 } 22.5 ^ { \circ } - 1

Question 259

Multiple Choice

Use an identity to write the expression as a single trigonometric function or as a single number.
- 2cos⁡222.5∘−12 \cos ^ { 2 } 22.5 ^ { \circ } - 1


A) 24\frac { \sqrt { 2 } } { 4 }
B) 33\frac { \sqrt { 3 } } { 3 }
C) 3\sqrt { 3 }
D) 22\frac { \sqrt { 2 } } { 2 }

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