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electronics and communication engineering signals and systems
1. The signumm function written as [sgn(t)] is defined as
(A): sgn(t) = - 1 for t < 0, = 0 for t = 0 and = 1 for t > 0
(B): sgn(t) = 0 for t < 0, = 1 for t = 0 and = 0 for t > 0
(C): sgn(t) = 0 for t < 0, = 1 for t3 0
(D): sgn(t) = 1 for t < 0, = 0 for t = 0 and = - 1 for t > 0
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