Find the joint probability density of the two random

Find the joint probability density of the two random variables x and y whose joint distrubution function is given by :

F(x) = {(1 - e^(-x^2))(1- e^(-y^2)) for x >0 , y >0 and 0 elsewhere)

Use the joint probability density obtained to find P(X + Y > 3)

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Find the joint probability density of the two random : find the joint probability density of the two random variables x and y whose joint distrubution function is given by fx

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