Question

A function 'f' is defined on the set of all real numbers except 0 and takes all real values

except 1.

It is also known that f(xy) = f(x)f(-y) - f(x) + f(y) for any x y 0, and f(1) f(-1).

Then which of the following is not true.​

Answer 1

Answer:

except 1 is not true answer