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The values of the integrals $$\int_{0}^{1}\left ( \int_{0}^{1}\frac{x-y}{(x+y)^3}dy \right )dx$$ and $$\int_{0}^{1}\left ( \int_{0}^{1}\frac{x-y}{(x+y)^3}dx \right )dy$$ are

1. same and equal to $0.5$
2. same and equal to $-0.5$
3. $0.5$ and $-0.5$, respectively
4. $-0.5$ and $0.5$, respectively