我有一個大學的機率數學題 ><!急

if the joint probability density of x and y is given by
f(x,y)= 24y(1-x-y) for x>0, y>0 , x+y<1 , 0 elsewhere
find
(a)the marginal density of x
(b) the marginal density of y
also determine whether the two random variables are independent


please steps by steps !
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