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Use an Identity to Write the Expression as a Single $2 \cos ^ { 2 } 75 ^ { \circ } - 1$

Question 173

Question 173

Multiple Choice

Use an identity to write the expression as a single trigonometric function or as a single number.
- $2 \cos ^ { 2 } 75 ^ { \circ } - 1$

A) $\frac { 1 } { 2 }$
B) $- \frac { 1 } { 2 }$
C) $- \frac { \sqrt { 3 } } { 2 }$
D) $\frac { \sqrt { 3 } } { 2 }$

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