Let y (t) = x (t) ? h (t) and let x (t) = rect (t + 4) ? rect (t ? 1) and let h (t) = tri (t ? 2) + tri (t ? 6) .
Find the range of times over which y (t) is not zero.
?3.5 < t < 8.5
All non-zero values of x are in the time range -4.5
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