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Use an Identity to Write the Expression as a Single $\cos ^ { 2 } 4 x - \sin ^ { 2 } 4 x$

Question 322

Multiple Choice

Use an identity to write the expression as a single trigonometric function or as a single number.
- $\cos ^ { 2 } 4 x - \sin ^ { 2 } 4 x$

A) $\cos 4 x$
B) $\cos 8 x$
C) $2 \sin 4 x$
D) $\frac { 1 } { 2 } \sin 16 x$

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