Determine the total energy and average power of the following signals and indicate whether it is an energy signal or power signal (or neither).
(a) x(t)=cos(5πt)
(b) x(t)=t−⁰.³u(t−1),u(t) : unit step function
(c) x[n]=e−⁰.⁵∣ⁿ∣
(d) x[n]=2cos(5πn/2)