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Determine if the following signals of time t in seconds are periodic. For periodic signals, find the fundamental angular frequency wo in rad/s and the fundamental period To in seconds. For non-periodic signals, explain why. (5 pts each) (a) x(t) = cos(|2t|) (b) x(t) = cos (2t) (c) x3 (t) = 2 cos (10t) + 3 sin (100) 99 (d) x(t) = 2 cos (1990) + 3 sin ( (e) x5 (t) cos (3) sin (4) = 100/2 101