... (5 t) (b)x2t=d2dt2x (t 1)【暨南電機】(a){x ( (t5))}+{x ( (t+5))} =X () ej5+X ... 【台科大電機】 1 0 1 2 3 t 1 xt xt=rectt14(a rectangular pulse with pulse ...
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