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Answer to Question #34840 in Math for priya
Question #34840
Find all the functions f (from rational numbers to rational numbers) such that
f(x+y) + f(x-y) = 2f(x) + 2f(y), for all rationals x,y.
f(x+y) + f(x-y) = 2f(x) + 2f(y), for all rationals x,y.
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