$\displaystyle - \frac{7}{4}$\displaystyle - \frac{7}{4}

$\displaystyle - \frac{1}{4}$\displaystyle - \frac{1}{4}

$\displaystyle \frac{1}{2}$\displaystyle \frac{1}{2}

$\displaystyle \frac{\sqrt{3}}{2}$\displaystyle \frac{\sqrt{3}}{2}