Find the values of the following signals at the indicated times.
(a) x (t) = 2 rect (t / 4) , x (? 1)
(b) x (t) = 5 rect (t / 2) sgn (2t) , x (0.5)
(c) x (t) = 9 rect (t / 10) sgn (3 (t ? 2) ) , x (1)
Answers: 2, ?9, 5
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