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Please help Problem 4 (3 points). Let f : A - B be a function. Prove that for any subsets A, and A2 of A,

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Problem 4 (3 points). Let f : A - B be a function. Prove that for any subsets A, and A2 of A, we have f(A] U A2) = f(Al) Uf(A2)

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