1. (a) lind autocovariance function and autocorrelation function of Poisson Process. (b) If X) A cos ct + B sin et and 1) = Bcos c1 - Asin ct. where c is a constant, A and B are uncorrelated random variables with mean 0 and variance 1. Examine whether {X(1)} and {Y(1)} are jointly widen -sense stationary or not,

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