Coefficients
\begin{align}
\begin{array}{c|cc}
- \frac{\sqrt{3}}{6} + \frac{1}{2} & \frac{1}{4} & - \frac{\sqrt{3}}{6} + \frac{1}{4}\\
\frac{\sqrt{3}}{6} + \frac{1}{2} & \frac{1}{4} + \frac{\sqrt{3}}{6} & \frac{1}{4}\\
\hline
& \frac{1}{2} & \frac{1}{2}
\end{array}\end{align}
Properties