If $ \int f(x) \, dx = g(x) $, then $ \int f(x) g(x) \, dx = $

Question

$ \frac{1}{2} f^2(x) $

$ \frac{1}{2} g^2(x) $

$ \frac{1}{2} \left(g'(x)\right)^2 $

$ f'(x) g(x) $

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