Question

Решите неравенство. Срочно

Answer 1

$2cos(3x-\frac{\pi}{3}) \leq \sqrt3\\\\cos(3x- \frac{\pi}{3}) \leq \frac{\sqrt3}{2} \\\\ \frac{\pi}{6}+2\pi k \leq 3x-\frac{\pi }{3} \leq \frac{11\pi }{6}+2\pi k\; ,\; \; k\in Z\\\\ \frac{\pi}{2}+2\pi k\leq 3x\leq \frac{13\pi }{6} +2\pi k\; ,\; \; k\in Z\\\\ \frac{\pi }{6}+\frac{2\pi k}{3} \leq x\leq \frac{13\pi }{18} +\frac{2\pi k}{3} \; ,\; \; k\in Z$