Let two-dimensional random variables (x, y) obey uniform distribution in region D, where D: 0

Because the two-dimensional random variables (x, y) obey uniform distribution in the region D, when (x, y) ∈ D, the probability density f (x, y) is the reciprocal of the area of the region D, and when (x, y) is not in D, f (x, y) is 0
Because D: 0

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