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Q. Let f:RR->RR be a function such that ...

Q. Let `f:RR->RR` be a function such that `f(x+y)+f(x-y)=f(xy)` for all `x,y in RR` then `f` is`:` (A) Strictly increasing.(B). Strictly decreasing (C). Identically zero. (D). Constant but not necessarily zero.

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