User:Collabi/sandbox

$$x(t) = 2a \left ( ft - \text{floor}\left ( \frac{1}{2} + ft \right ) \right ) $$

$$x(t) = 2 \times \text{abs} \left ( 2a \left ( ft - \text{floor}\left ( \frac{1}{2} + ft \right ) \right ) \right ) - a $$

$$x(t) = 4 \times \text{abs} \left ( a \left ( ft - \text{floor}\left ( \frac{1}{2} + ft \right ) \right ) \right ) - a $$

$$ \begin{matrix} a & b \\ c & d \end{matrix} \qquad d = c - a + b $$