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$ x \ge \frac52 $: - Portal da AcÃºstica

📅 March 1, 2026 👤 scraface

Mar 01, 2026

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📌 Using $ \arctan\left(\frac{3}{4}\right) \approx 0.6435 $ radians:

📌 t \approx \frac{6}{\pi} \left( \frac{\pi}{2} - 0.6435 \right) \approx \frac{6}{\pi} (1.5708 - 0.6435) = \frac{6}{\pi} (0.9273) \approx 1.77 \text{ hours}

📌 So the maximum tide height of $ \boxed{5} $ occurs approximately at $ \boxed{1.77} $ hours after midnight, or around 1:46 AM.

📌 Question: A physiological researcher is analyzing the periodic response of heart rate variability over a 24-hour period, modeled by the function $ f(t) = 5\cos\left(\frac{\pi}{12}t\right) + 12\sin\left(\frac{\pi}{12}t\right) $. What is the amplitude of this function, and at what time does the maximum occur?

📌 This function can be expressed in the form $ R\cos\left(\frac{\pi}{12}t - \phi\right) $, where $ R = \sqrt{5^2 + 12^2} = \sqrt{25 + 144} = \sqrt{169} = 13 $

📌 So the amplitude is $ \boxed{13} $.

📌 To find the time of maximum:

📌 \tan\phi = \frac{12}{5} \Rightarrow \phi = \arctan\left(\frac{12}{5}\right) \approx 1.176 \text{ radians}

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