The random variables X and Y have joint PDF given by:
f(x, y) =(1/(10)), (x,y)∈[-1,1] [-2, 2] ∪ [1, 2] [-1,1]

(a) Find the conditional PDFs f(y\x) and f(x\y)
(b) Find E[X\Y ], E[X] and var(X\Y ). Use these to calculate var(X).