Question

Помогите пожалуйста ❤️❤️❤️❤️❤️

Answer 1

$sin(x+\frac{\pi}{4})\leq \frac{\sqrt2}{2}\\\\\frac{3\pi}{4}+2\pi n\leq x+\frac{\pi}{4}\leq \frac{9\pi }{4}+2\pi n\; ,\; n\in Z\\\\\frac{\pi }{2}+2\pi n\leq x\leq 2\pi +2\pi n\; ,\; n\in Z\\\\x\in [\; \frac{\pi }{2}+2\pi n\; ;\; 2\pi +2\pi n\; ]\; ,\; n\in Z$