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1) \( y=3 \sin \left(\frac{\theta}{3}-\frac{\pi}{2}\right)+2 \)

Ask by Stephens Gardner. in the United States
Mar 11,2025

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The function \( y=3 \sin \left(\frac{\theta}{3}-\frac{\pi}{2}\right)+2 \) has a domain of all real numbers, a range of \([-1, 5]\), critical points at \( \theta = 3(n + 1)\pi \), and inflection points at \( \theta = 3n\pi + \frac{3\pi}{2} \). Its periodicity is \( 6\pi \).

Solution

Function by following steps: - step0: Determine the period: \(y=-3\cos\left(\frac{\theta }{3}\right)+2\) - step1: Calculate: \(y=-3\cos\left(\frac{1}{3}\theta \right)+2\) - step2: The period of the function is \(\frac{2\pi }{\left|\frac{1}{3}\right|}:\) \(\frac{2\pi }{\left|\frac{1}{3}\right|}\) - step3: Calculate: \(\frac{2\pi }{\frac{1}{3}}\) - step4: Divide the terms: \(6\pi \) It seems there was an issue retrieving the results for the analysis of the function \( y=3 \sin \left(\frac{\theta}{3}-\frac{\pi}{2}\right)+2 \) for domain, range, critical points, inflection points, and intervals. However, I was able to determine the periodicity of the function. ### Periodicity The periodicity of the function is \( 6\pi \). This means that the function repeats its values every \( 6\pi \) units along the \(\theta\) axis. ### Further Analysis Let's analyze the function step by step to find the domain, range, critical points, and inflection points manually. 1. **Domain**: - The sine function is defined for all real numbers, so the domain of \( y \) is all real numbers: \[ \text{Domain: } (-\infty, \infty) \] 2. **Range**: - The sine function oscillates between -1 and 1. Therefore, multiplying by 3 gives us a range of -3 to 3. Adding 2 shifts this range up by 2: \[ \text{Range: } [-1, 5] \] 3. **Critical Points**: - To find critical points, we need to take the derivative of \( y \) and set it to zero. The derivative is: \[ y' = 3 \cdot \cos\left(\frac{\theta}{3} - \frac{\pi}{2}\right) \cdot \frac{1}{3} = \cos\left(\frac{\theta}{3} - \frac{\pi}{2}\right) \] Setting \( y' = 0 \): \[ \cos\left(\frac{\theta}{3} - \frac{\pi}{2}\right) = 0 \] This occurs when: \[ \frac{\theta}{3} - \frac{\pi}{2} = \frac{\pi}{2} + n\pi \quad (n \in \mathbb{Z}) \] Solving for \(\theta\): \[ \theta = 3\left(n\pi + \pi\right) = 3(n + 1)\pi \] Thus, the critical points occur at \( \theta = 3(n + 1)\pi \). 4. **Inflection Points**: - Inflection points occur where the second derivative changes sign. The second derivative is: \[ y'' = -\frac{1}{3} \sin\left(\frac{\theta}{3} - \frac{\pi}{2}\right) \] Setting \( y'' = 0 \): \[ -\frac{1}{3} \sin\left(\frac{\theta}{3} - \frac{\pi}{2}\right) = 0 \] This occurs when: \[ \sin\left(\frac{\theta}{3} - \frac{\pi}{2}\right) = 0 \] This occurs at: \[ \frac{\theta}{3} - \frac{\pi}{2} = n\pi \quad (n \in \mathbb{Z}) \] Solving for \(\theta\): \[ \theta = 3n\pi + \frac{3\pi}{2} \] ### Summary - **Domain**: \( (-\infty, \infty) \) - **Range**: \( [-1, 5] \) - **Critical Points**: \( \theta = 3(n + 1)\pi \) - **Inflection Points**: \( \theta = 3n\pi + \frac{3\pi}{2} \) - **Periodicity**: \( 6\pi \) If you need further analysis or specific calculations, feel free to ask!

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This equation represents a sinusoidal function, specifically a sine wave that has been transformed. The wave has been vertically shifted up by 2 units, amplified 3 times its standard amplitude, and horizontally stretched due to the coefficient of \(\frac{1}{3}\) in front of \(\theta\). The phase shift of \(-\frac{\pi}{2}\) suggests that the wave starts differently on the x-axis, creating interesting behaviors as \(\theta\) varies. In real-world applications, functions like this can model various phenomena, such as sound waves, tides, or even seasonal temperature changes. The sine function is particularly useful in physics for representing periodic motions, and in engineering for waveforms in signal processing. By adjusting the parameters, you can fit the model to various cyclical patterns observed in nature or technology!

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