1. Which of the following signals are monotonic in nature? a) 1-exp(-t) b) 1-exp(sin(t)) c) log(tan(t)) d) cos(t) AnswerAnswer: a [Reason:] All of the other functions have a periodic element in them, which means the function attains the same value after a period of time, which should not occur for a monotonic function. 2. What…