QuestionLet (X,Y)∼Uniform(D)(X,Y)\sim \mathrm{Uniform}(D), where D={(x,y):x+y<3, x>0, y>0}D=\{(x,y):x+y<3,\ x>0,\ y>0\}. What is the marginal density function of fX(x)f_X(x)?
