f(x)=\left\{\begin{array}{cc} <br />                          -t-5 &amp; -6\leq t \leq -5 \\<br />                          t+3  &amp; -3\leq t\leq -2  \\<br />                          -t-1 &amp; -2\leq t\leq -1 \\<br />                           t-1  &amp; 1\leq t\leq 2 \\<br />                          -t+3  &amp; 2\leq t \leq 3 \\<br />                          t-5  &amp; 5\leq t \leq 6 \\<br />                          0    &amp; \text{otherwise}<br />                          \end{array}\right.<br />
{}