\[y = \sin x.\]
\[1)\ \left( - \frac{\pi}{2};\ 0 \right):\]
\[y\left( - \frac{\pi}{2} \right) = \sin\left( - \frac{\pi}{2} \right) =\]
\[= - \sin\frac{\pi}{2} = - 1.\]
\[Ответ:\ \ нет.\]
\[2)\ \left( \frac{\pi}{2};\ 1 \right):\]
\[y\left( \frac{\pi}{2} \right) = \sin\frac{\pi}{2} = 1.\]
\[Ответ:\ \ да.\]
\[3)\ \left( \frac{3\pi}{4};\ - \frac{\sqrt{2}}{2} \right):\]
\[y\left( \frac{3\pi}{4} \right) = \sin\frac{3\pi}{4} = \sin\frac{\pi}{4} = \frac{\sqrt{2}}{2}.\]
\[Ответ:\ \ нет.\]
\[4)\ \left( \frac{2\pi}{3};\ \frac{\sqrt{3}}{2} \right):\]
\[y\left( \frac{2\pi}{3} \right) = \sin\frac{2\pi}{3} = \sin\frac{\pi}{3} = \frac{\sqrt{3}}{2}.\]
\[Ответ:\ \ да.\]