4) The joint probability density function of two random variables is: fxy(x, y) = {c(1 + xy) 0 ≤ x ≤ 1 and 0 ≤ y ≤ 2 elsewhere a) Find Fxy (0.5, 1.0). b) Find fxy(x, 1). c) Find fxy(x | 1).

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