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

$\displaystyle - \frac{1}{3}$\displaystyle - \frac{1}{3}

$\displaystyle - \frac{5}{12}$\displaystyle - \frac{5}{12}

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