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 P: 15 What I did: u = x+y so x = u-y y = u-x x $$\geq$$ 0 y $$\geq$$ 0 y $$\leq$$ 1-x u-y $$\geq$$ 0 $$\rightarrow$$ u $$\geq$$ y u-x $$\geq$$ 0 $$\rightarrow$$ u $$\geq$$ x u <= 1 x $$\in$$ [0,1] y $$\in$$ [0,1] So u $$\in$$ [0,1] And I don't know what to do about the integral and the Jacobian, etc :( what to you think about? Ps: OMG, tex isn't working :(