1.

If f(x - y) ,f(x) f(y) and f(x + y) are in A.P for all x, y ∈ R and f (0) ≠ 0 then-

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If f(x - y) ,f(x) f(y) and f(x + y) are in A.P for all x, y R and f (0) 0 then-




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