\renewcommand{\arraystretch}{2}
$$\begin{array}{|c||c|c|c|c|c|}
 \hline
 & 0 & \frac{\pi}{6} & \frac{\pi}{4} & \frac{\pi}{3} & \frac{\pi}{2}\\
 \hline
 \hline
 \sin & \frac{\sqrt{0}}{2} = 0 & \frac{\sqrt{1}}{2} = \frac{1}{2} & \frac{\sqrt{2}}{2} & \frac{\sqrt{3}}{2} & \frac{\sqrt{4}}{2}=\frac{2}{2} = 1\\
 \hline
\end{array}$$