Use an identity to write the expression as a single trigonometric function or as a single number.
-$$2 \cos ^ { 2 } 4 x - 1$$

Name: Use an identity to write the expression as a single trigonometric function or as a single number. -\[2 \cos ^ { 2 } 4 x - 1\]
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Quizplus · Accepted Answer

This expression can be simplified using the double angle identity for cosine, which states that $\cos(2\theta) = 2\cos^2(\theta) - 1$. By applying this identity, where $\theta = 4x$, the expression simplifies to $\cos(8x)$, making option D correct.

Use an Identity to Write the Expression as a Single 2cos⁡24x−12 \cos ^ { 2 } 4 x - 12cos24x−1

Use an Identity to Write the Expression as a Single $2 \cos ^ { 2 } 4 x - 1$