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A(t) is a wide-sense stationary random process and is a random variable distributed uniformly over [0, 211]. Furthermore, is
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1587607563799_IMG-1807.pngin (2ext to 2 Sin Sin(20 xt) oxt + 2x) - 2 = 2x sin 25 x cos(40 nt + 2x) 20 E ( x)) =0 tot. -- Cow ( x 62, X(h)) = E(X(t) * XX (t ) is wide-sense stationary Similarly, using E ( ces (sont to)) = 27 sin(507t to) we have ELY(t)) = 0. t t. f CowCY (+Now z (t) = X (t) + Y (t ) n Elzit)) = o. t Cou(z(t), 28(h)) = cov( x (D ) +y (t ), X (h) + Y Cb)) e cow (X (t), X (h)) + CowNow, Ellos ( 205 t t sokh +20) ) Sin 200 t +50th +20 4 a 2 = a Junction of tfh & not of (t-h) so 2 (t) is not stationary.

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