Problem 3 A continuous-time random signal consists of two sinusoids: a (t) = Asin (wit) + Bcos (w2t), wi =2nfi,i = 1,2 in which the magnitude A, B are independent Gaussian random variables with the following PDF: 1 fA(a) = p-a2 / (20?) V2701 1 fB(b) = e - 62 / ( 20 ? ) V2102 Find the conditions that make x(t) a strictly stationary random signal. The symbol U stands for uniform distribution. "With the same notation in the textbook, F(.) denotes the CDF of a random variable and f(.) denote the PDF. Specifically, Fy(y) stands for CDF of Y and fy (y) stands for PDF of Y