\[1)\sin x = \frac{2}{3\pi}x - \frac{2}{3}\]
\[y = \sin x;\ y = \frac{2}{3\pi}x - \frac{2}{3}.\]
\[Ответ:\ \]
\[- \frac{\pi}{2};\ \approx 1,25;\ \pi;\ \approx 7,5;\ \frac{5\pi}{2}.\]
\[2)\sin x = 2 - \frac{2}{\pi}x\]
\[y = \sin x;\ y = 2 - \frac{2}{\pi}\text{x.}\]
\[Ответ:\ \ \frac{\pi}{2};\ \pi;\ \frac{3\pi}{2}.\]
\[3) - \sin x = \sqrt{x};\]
\[y = - \sin x;\ y = \sqrt{x}.\]
\[Ответ:\ \ 0.\]
\[4)\sin x = \cos x\]
\[y = \sin x;\ y = \cos x.\]
\[Ответ:\ \ \frac{\pi}{4} + \pi\text{n.}\]