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IF (x-y)f(x+y)-(x+y)f(x-y)=4xy(x+y)(x-y)for all x,y find f(x). IF (x-y)f(x+y)-(x+y)f(x-y)=4xy(x+y)(x-y)for all x,y find f(x).
IF (x-y)f(x+y)-(x+y)f(x-y)=4xy(x+y)(x-y)for all x,y find f(x).
Let a = (x+y), b = (x-y) then Then the equation can be written as b f(a) – a f(b) = ab (a2-b2). Setting b = 1, we get f(a) – a f(1) = a3-a Let f(1) = k, then f(a) = a3+(k-1)a
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