A pair of random variables has a joint characteristic function given by (a) Find E [X] and

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A pair of random variables has a joint characteristic function given by
ల(3+e- 2 * 90క్త) +9 w ీy ఆ, ) exp

(a) Find E [X] and E [Y]
(b) Find E [XY] and Cov (X, Y).
(c) Find E [X2Y2] and E [XY3].

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