Question: A function f: RR satisfies the equation f(x) f(y)- f(xy)= x+y V x, y e R and f(1)>0, then (A) f(x) f'(x)= x -4

A function f: RR satisfies the equation f(x) f(y)- f(xy)= x+y V

A function f: RR satisfies the equation f(x) f(y)- f(xy)= x+y V x, y e R and f(1)>0, then (A) f(x) f'(x)= x -4 (B) f(x) f"'(x)= x -6 (C) f(x) f(x) = x -1 (D) none of these

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