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Choose the correct answer from the drop-down menu. Rewrite \( 4 \sin ^{2} \theta \cos ^{2} \theta \) in terms with no power greater than one. \[ \begin{array}{l}4 \sin ^{2} \theta \cos ^{2} \theta=\text { Select... } v \\ \qquad \frac{1}{2}-\frac{1}{2}-\frac{1}{2} \cos 4 \theta \\ \frac{1}{2}+\frac{1}{2} \cos 2 \theta \\ 1\end{array}+\frac{1}{2} \cos 2 \theta \]

Ask by Goodwin Lambert. in the United Arab Emirates
Feb 26,2025

Upstudy AI Solution

Tutor-Verified Answer

Answer

The correct rewrite is \( \frac{1}{2} - \frac{1}{2} \cos 4\theta \).

Solution

We start with   4 sin²θ cos²θ Notice that   sin²θ cos²θ = (¼) sin²2θ       [since sin 2θ = 2 sinθ cosθ] Thus   4 sin²θ cos²θ = 4·(1/4) sin²2θ = sin²2θ. Next, recall the power‐reducing identity for sine squared:   sin²α = (1 – cos 2α)/2. Using α = 2θ gives   sin²2θ = (1 – cos 4θ)/2. Therefore, we have   4 sin²θ cos²θ = (1 – cos 4θ)/2. Since this final expression has only first powers of sine and cosine, the correct rewrite is   (1/2) – (1/2) cos 4θ. Thus, from the drop‐down options provided, choose   1/2 – 1/2 cos 4θ.

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The Deep Dive

To rewrite \( 4 \sin^{2} \theta \cos^{2} \theta \) in terms with no power greater than one, you can use the double angle identity for sine. Recall that \( \sin(2\theta) = 2 \sin(\theta) \cos(\theta) \), therefore: \[ 4 \sin^{2} \theta \cos^{2} \theta = 4 \left( \frac{1}{2} \sin(2\theta) \right)^{2} = \sin^{2}(2\theta). \] Using the identity \( \sin^{2}(x) = \frac{1 - \cos(2x)}{2} \): \[ \sin^{2}(2\theta) = \frac{1 - \cos(4\theta)}{2}. \] Thus, multiplying by 2 gives: \[ 4 \sin^{2} \theta \cos^{2} \theta = \frac{1 - \cos(4\theta)}{2}. \] By rearranging this expression, it turns out that the correct option would be: \[ 4 \sin^{2} \theta \cos^{2} \theta = \frac{1}{2} - \frac{1}{2} \cos(4\theta). \]

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