(c) X() exp(-2 If-10) (d) X() exp[-2m(2-10)] 1.8. Find the autocorrelation function of x(t) = A cos (2nfot + b) in terms of its period, To-1/f. Find the average normalized power of x(t), using P, = R(0). 1.9. (a) Use the results of Problem 1.8 to find the autocorrelation function R(T) of wave- form x(t) 10 cos 10r + 20 cos 20. (b) Use the relationship P, R(0) to find the average normalized power in x(t). Compare the answer with the answers to Problems 1.4 and 1.5.1 1.10. For the function x(t)=1+ cos 2nfo, calculate (a) the average value of x(t); (b) the ac power of x(); (e) the rms value of x(t). 1.11. Consider a random process given by X(r) A cos (2mfol + b), where A and fo are