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Fourth proportional to(a^2-b^2\ ),\ (...

Fourth proportional to`(a^2-b^2\ ),\ (a^2-a b),\ (a^3+b^3)` is `(a-b)` b. `a^4+b^4` c. `a(a^2-a b+b^2)` d. `a^3-a^2b^2+b^2`

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