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Let f(x)=f(a-x) and g(x)+g(a-x)=4 then...

Let `f(x)=f(a-x) and g(x)+g(a-x)=4` then `int_0^af(x)g(x)dx` is equal to (A) `2int_0^af(x)dx` (B) `int_0^af(x)dx` (C) `4int_0^af(x)dx` (D) `0`

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