The function `f` and `g` are positive and continuous. If `f` is increasing and `g` is decreasing, then `int_0^1f(x)[g(x)-g(1-x)]dx`
(a)is always non-positive
(b)is always non-negative
(c)can take positive and negative values
(d)none of these

int [f(x)g"(x) - f"(x)g(x)]dx is

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