Let X and Y be two continous random variables with the joint pdf f$($x$,$y$)=1$ if $0<=$x$,$y$<=1$ and x$+$y$<=1,$ or $-1<=$x$<=0,0<=$y$<=1$ and $-$x$+$y$<=1.$ Using the joint pdf$,$ find the marginal pdf of X and Y$.$ Specify rhe support in both cases. Please explain in a lot of detail