(a) If x(t) = tri(t/3) ? ? (t ? 2) and y(t) = x(2t) , what is the numerical range of values of t for which y (t) is not zero?
(b) If x(t) = tri(t/w) ? ? (t + t 0) and y(t) = x (at) , what is the range of values of t (in terms of w, t0 and a) for which y(t) is not zero?
(a) - 1 / 2
(b) 
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