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Let f be a function such that f(x).f\'(-...

Let `f` be a function such that `f(x).f\'(-x)=f(-x).f\'(x)` for all `x` and `f(0)=3`. Now answer the question:The value of `f(x)f(-x)` for all `x` is (A) `9` (B) `4` (C) `16` (D) `12`

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