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\( \sin ( x + \frac { \pi } { 4 } ) \leq \frac { 1 } { 2 } \)

Ask by Peters Medina. in Kazakhstan
Nov 02,2024

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Решение неравенства \( \sin \left( x + \frac{\pi}{4} \right) \leq \frac{1}{2} \): \[ x \in \left(-\infty, \frac{1}{2} - \frac{\pi}{4}\right] \cup \left[\frac{7\pi}{12}, +\infty\right) \]

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To solve the inequality \( \sin ( x + \frac { \pi } { 4 } ) \leq \frac { 1 } { 2 } \), we first need to find the angles where the sine function reaches \( \frac{1}{2} \). This occurs at \( \frac{\pi}{6} \) and \( \frac{5\pi}{6} \) in the standard sine curve. To translate this to our equation, we set up the following: 1. \( x + \frac{\pi}{4} = \frac{\pi}{6} + 2k\pi \) 2. \( x + \frac{\pi}{4} = \frac{5\pi}{6} + 2k\pi \) Solving these gives us the general solutions for \( x \). Subsequently, we need to determine the angles where \( \sin(x + \frac{\pi}{4}) \) is less than \( \frac{1}{2} \), which can be further analyzed using a unit circle or sine graph, identifying the intervals corresponding to these angles. Lastly, remember that sine is periodic with a period of \( 2\pi \), allowing us to extend our solutions across all cycles. Happy solving!

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