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If f(2x+y/8,2x-y/8)=x y , then f(m , n)+...

If `f(2x+y/8,2x-y/8)=x y` , then `f(m , n)+f(n,m)=0` (a) only when `m=n` (b) only when `m!=n` (c) only when `m=-n` (d) for all m and n

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